diff --git a/misc/typeshed_patches/0001-Revert-Remove-redundant-inheritances-from-Iterator.patch b/misc/typeshed_patches/0001-Revert-Remove-redundant-inheritances-from-Iterator.patch
index d3f49a4eef3e..fdcc14cec3c6 100644
--- a/misc/typeshed_patches/0001-Revert-Remove-redundant-inheritances-from-Iterator.patch
+++ b/misc/typeshed_patches/0001-Revert-Remove-redundant-inheritances-from-Iterator.patch
@@ -1,4 +1,4 @@
-From c217544146d36899d50e828d627652a0d8f63bb7 Mon Sep 17 00:00:00 2001
+From 438dbb1300b77331940d7db8f010e97305745116 Mon Sep 17 00:00:00 2001
 From: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
 Date: Sat, 21 Dec 2024 22:36:38 +0100
 Subject: [PATCH] Revert Remove redundant inheritances from Iterator in
@@ -15,7 +15,7 @@ Subject: [PATCH] Revert Remove redundant inheritances from Iterator in
  7 files changed, 34 insertions(+), 34 deletions(-)
 
 diff --git a/mypy/typeshed/stdlib/_asyncio.pyi b/mypy/typeshed/stdlib/_asyncio.pyi
-index ed56f33af..5253e967e 100644
+index d663f5d93..f43178e4d 100644
 --- a/mypy/typeshed/stdlib/_asyncio.pyi
 +++ b/mypy/typeshed/stdlib/_asyncio.pyi
 @@ -1,6 +1,6 @@
@@ -26,59 +26,59 @@ index ed56f33af..5253e967e 100644
  from contextvars import Context
  from types import FrameType, GenericAlias
  from typing import Any, Literal, TextIO, TypeVar
-@@ -10,7 +10,7 @@ _T = TypeVar("_T")
- _T_co = TypeVar("_T_co", covariant=True)
+@@ -11,7 +11,7 @@ _T_co = TypeVar("_T_co", covariant=True)
  _TaskYieldType: TypeAlias = Future[object] | None
  
+ @disjoint_base
 -class Future(Awaitable[_T]):
 +class Future(Awaitable[_T], Iterable[_T]):
      _state: str
      @property
      def _exception(self) -> BaseException | None: ...
 diff --git a/mypy/typeshed/stdlib/builtins.pyi b/mypy/typeshed/stdlib/builtins.pyi
-index 0575be3c8..d9be595fe 100644
+index f2dd00079..784ee7eac 100644
 --- a/mypy/typeshed/stdlib/builtins.pyi
 +++ b/mypy/typeshed/stdlib/builtins.pyi
-@@ -1186,7 +1186,7 @@ class frozenset(AbstractSet[_T_co]):
-     def __hash__(self) -> int: ...
+@@ -1209,7 +1209,7 @@ class frozenset(AbstractSet[_T_co]):
      def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
  
+ @disjoint_base
 -class enumerate(Generic[_T]):
 +class enumerate(Iterator[tuple[int, _T]]):
      def __new__(cls, iterable: Iterable[_T], start: int = 0) -> Self: ...
      def __iter__(self) -> Self: ...
      def __next__(self) -> tuple[int, _T]: ...
-@@ -1380,7 +1380,7 @@ else:
- 
+@@ -1405,7 +1405,7 @@ else:
  exit: _sitebuiltins.Quitter
  
+ @disjoint_base
 -class filter(Generic[_T]):
 +class filter(Iterator[_T]):
      @overload
      def __new__(cls, function: None, iterable: Iterable[_T | None], /) -> Self: ...
      @overload
-@@ -1444,7 +1444,7 @@ license: _sitebuiltins._Printer
+@@ -1469,7 +1469,7 @@ license: _sitebuiltins._Printer
  
  def locals() -> dict[str, Any]: ...
- 
+ @disjoint_base
 -class map(Generic[_S]):
 +class map(Iterator[_S]):
      # 3.14 adds `strict` argument.
      if sys.version_info >= (3, 14):
          @overload
-@@ -1750,7 +1750,7 @@ def pow(base: _SupportsSomeKindOfPow, exp: complex, mod: None = None) -> complex
- 
+@@ -1776,7 +1776,7 @@ def pow(base: _SupportsSomeKindOfPow, exp: complex, mod: None = None) -> complex
  quit: _sitebuiltins.Quitter
  
+ @disjoint_base
 -class reversed(Generic[_T]):
 +class reversed(Iterator[_T]):
      @overload
      def __new__(cls, sequence: Reversible[_T], /) -> Iterator[_T]: ...  # type: ignore[misc]
      @overload
-@@ -1814,7 +1814,7 @@ def vars(object: type, /) -> types.MappingProxyType[str, Any]: ...
+@@ -1840,7 +1840,7 @@ def vars(object: type, /) -> types.MappingProxyType[str, Any]: ...
  @overload
  def vars(object: Any = ..., /) -> dict[str, Any]: ...
- 
+ @disjoint_base
 -class zip(Generic[_T_co]):
 +class zip(Iterator[_T_co]):
      if sys.version_info >= (3, 10):
@@ -131,97 +131,102 @@ index 910d63814..eb942bc55 100644
          # encoding and errors are added
          @overload
 diff --git a/mypy/typeshed/stdlib/itertools.pyi b/mypy/typeshed/stdlib/itertools.pyi
-index d0085dd72..7d05b1318 100644
+index fe4ccbdf8..73745fe92 100644
 --- a/mypy/typeshed/stdlib/itertools.pyi
 +++ b/mypy/typeshed/stdlib/itertools.pyi
-@@ -27,7 +27,7 @@ _Predicate: TypeAlias = Callable[[_T], object]
- 
+@@ -28,7 +28,7 @@ _Predicate: TypeAlias = Callable[[_T], object]
  # Technically count can take anything that implements a number protocol and has an add method
  # but we can't enforce the add method
+ @disjoint_base
 -class count(Generic[_N]):
 +class count(Iterator[_N]):
      @overload
      def __new__(cls) -> count[int]: ...
      @overload
-@@ -37,12 +37,12 @@ class count(Generic[_N]):
-     def __next__(self) -> _N: ...
+@@ -39,13 +39,13 @@ class count(Generic[_N]):
      def __iter__(self) -> Self: ...
  
+ @disjoint_base
 -class cycle(Generic[_T]):
 +class cycle(Iterator[_T]):
      def __new__(cls, iterable: Iterable[_T], /) -> Self: ...
      def __next__(self) -> _T: ...
      def __iter__(self) -> Self: ...
  
+ @disjoint_base
 -class repeat(Generic[_T]):
 +class repeat(Iterator[_T]):
      @overload
      def __new__(cls, object: _T) -> Self: ...
      @overload
-@@ -51,7 +51,7 @@ class repeat(Generic[_T]):
-     def __iter__(self) -> Self: ...
+@@ -55,7 +55,7 @@ class repeat(Generic[_T]):
      def __length_hint__(self) -> int: ...
  
+ @disjoint_base
 -class accumulate(Generic[_T]):
 +class accumulate(Iterator[_T]):
      @overload
      def __new__(cls, iterable: Iterable[_T], func: None = None, *, initial: _T | None = ...) -> Self: ...
      @overload
-@@ -59,7 +59,7 @@ class accumulate(Generic[_T]):
-     def __iter__(self) -> Self: ...
+@@ -64,7 +64,7 @@ class accumulate(Generic[_T]):
      def __next__(self) -> _T: ...
  
+ @disjoint_base
 -class chain(Generic[_T]):
 +class chain(Iterator[_T]):
      def __new__(cls, *iterables: Iterable[_T]) -> Self: ...
      def __next__(self) -> _T: ...
      def __iter__(self) -> Self: ...
-@@ -68,22 +68,22 @@ class chain(Generic[_T]):
-     def from_iterable(cls: type[Any], iterable: Iterable[Iterable[_S]], /) -> chain[_S]: ...
+@@ -74,25 +74,25 @@ class chain(Generic[_T]):
      def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
  
+ @disjoint_base
 -class compress(Generic[_T]):
 +class compress(Iterator[_T]):
      def __new__(cls, data: Iterable[_T], selectors: Iterable[Any]) -> Self: ...
      def __iter__(self) -> Self: ...
      def __next__(self) -> _T: ...
  
+ @disjoint_base
 -class dropwhile(Generic[_T]):
 +class dropwhile(Iterator[_T]):
      def __new__(cls, predicate: _Predicate[_T], iterable: Iterable[_T], /) -> Self: ...
      def __iter__(self) -> Self: ...
      def __next__(self) -> _T: ...
  
+ @disjoint_base
 -class filterfalse(Generic[_T]):
 +class filterfalse(Iterator[_T]):
      def __new__(cls, function: _Predicate[_T] | None, iterable: Iterable[_T], /) -> Self: ...
      def __iter__(self) -> Self: ...
      def __next__(self) -> _T: ...
  
+ @disjoint_base
 -class groupby(Generic[_T_co, _S_co]):
 +class groupby(Iterator[tuple[_T_co, Iterator[_S_co]]], Generic[_T_co, _S_co]):
      @overload
      def __new__(cls, iterable: Iterable[_T1], key: None = None) -> groupby[_T1, _T1]: ...
      @overload
-@@ -91,7 +91,7 @@ class groupby(Generic[_T_co, _S_co]):
-     def __iter__(self) -> Self: ...
+@@ -101,7 +101,7 @@ class groupby(Generic[_T_co, _S_co]):
      def __next__(self) -> tuple[_T_co, Iterator[_S_co]]: ...
  
+ @disjoint_base
 -class islice(Generic[_T]):
 +class islice(Iterator[_T]):
      @overload
      def __new__(cls, iterable: Iterable[_T], stop: int | None, /) -> Self: ...
      @overload
-@@ -99,19 +99,19 @@ class islice(Generic[_T]):
-     def __iter__(self) -> Self: ...
+@@ -110,20 +110,20 @@ class islice(Generic[_T]):
      def __next__(self) -> _T: ...
  
+ @disjoint_base
 -class starmap(Generic[_T_co]):
 +class starmap(Iterator[_T_co]):
      def __new__(cls, function: Callable[..., _T], iterable: Iterable[Iterable[Any]], /) -> starmap[_T]: ...
      def __iter__(self) -> Self: ...
      def __next__(self) -> _T_co: ...
  
+ @disjoint_base
 -class takewhile(Generic[_T]):
 +class takewhile(Iterator[_T]):
      def __new__(cls, predicate: _Predicate[_T], iterable: Iterable[_T], /) -> Self: ...
@@ -229,52 +234,52 @@ index d0085dd72..7d05b1318 100644
      def __next__(self) -> _T: ...
  
  def tee(iterable: Iterable[_T], n: int = 2, /) -> tuple[Iterator[_T], ...]: ...
- 
+ @disjoint_base
 -class zip_longest(Generic[_T_co]):
 +class zip_longest(Iterator[_T_co]):
      # one iterable (fillvalue doesn't matter)
      @overload
      def __new__(cls, iter1: Iterable[_T1], /, *, fillvalue: object = ...) -> zip_longest[tuple[_T1]]: ...
-@@ -189,7 +189,7 @@ class zip_longest(Generic[_T_co]):
-     def __iter__(self) -> Self: ...
+@@ -202,7 +202,7 @@ class zip_longest(Generic[_T_co]):
      def __next__(self) -> _T_co: ...
  
+ @disjoint_base
 -class product(Generic[_T_co]):
 +class product(Iterator[_T_co]):
      @overload
      def __new__(cls, iter1: Iterable[_T1], /) -> product[tuple[_T1]]: ...
      @overload
-@@ -274,7 +274,7 @@ class product(Generic[_T_co]):
-     def __iter__(self) -> Self: ...
+@@ -288,7 +288,7 @@ class product(Generic[_T_co]):
      def __next__(self) -> _T_co: ...
  
+ @disjoint_base
 -class permutations(Generic[_T_co]):
 +class permutations(Iterator[_T_co]):
      @overload
      def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> permutations[tuple[_T, _T]]: ...
      @overload
-@@ -288,7 +288,7 @@ class permutations(Generic[_T_co]):
-     def __iter__(self) -> Self: ...
+@@ -303,7 +303,7 @@ class permutations(Generic[_T_co]):
      def __next__(self) -> _T_co: ...
  
+ @disjoint_base
 -class combinations(Generic[_T_co]):
 +class combinations(Iterator[_T_co]):
      @overload
      def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> combinations[tuple[_T, _T]]: ...
      @overload
-@@ -302,7 +302,7 @@ class combinations(Generic[_T_co]):
-     def __iter__(self) -> Self: ...
+@@ -318,7 +318,7 @@ class combinations(Generic[_T_co]):
      def __next__(self) -> _T_co: ...
  
+ @disjoint_base
 -class combinations_with_replacement(Generic[_T_co]):
 +class combinations_with_replacement(Iterator[_T_co]):
      @overload
      def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> combinations_with_replacement[tuple[_T, _T]]: ...
      @overload
-@@ -317,13 +317,13 @@ class combinations_with_replacement(Generic[_T_co]):
-     def __next__(self) -> _T_co: ...
+@@ -334,14 +334,14 @@ class combinations_with_replacement(Generic[_T_co]):
  
  if sys.version_info >= (3, 10):
+     @disjoint_base
 -    class pairwise(Generic[_T_co]):
 +    class pairwise(Iterator[_T_co]):
          def __new__(cls, iterable: Iterable[_T], /) -> pairwise[tuple[_T, _T]]: ...
@@ -282,6 +287,7 @@ index d0085dd72..7d05b1318 100644
          def __next__(self) -> _T_co: ...
  
  if sys.version_info >= (3, 12):
+     @disjoint_base
 -    class batched(Generic[_T_co]):
 +    class batched(Iterator[tuple[_T_co, ...]], Generic[_T_co]):
          if sys.version_info >= (3, 13):
@@ -307,18 +313,18 @@ index b79f9e773..f276372d0 100644
      def __iter__(self) -> Self: ...
      def next(self, timeout: float | None = None) -> _T: ...
 diff --git a/mypy/typeshed/stdlib/sqlite3/__init__.pyi b/mypy/typeshed/stdlib/sqlite3/__init__.pyi
-index bcfea3a13..5a659deac 100644
+index 6b0f1ba94..882cd143c 100644
 --- a/mypy/typeshed/stdlib/sqlite3/__init__.pyi
 +++ b/mypy/typeshed/stdlib/sqlite3/__init__.pyi
-@@ -405,7 +405,7 @@ class Connection:
-         self, type: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None, /
+@@ -407,7 +407,7 @@ class Connection:
      ) -> Literal[False]: ...
  
+ @disjoint_base
 -class Cursor:
 +class Cursor(Iterator[Any]):
      arraysize: int
      @property
      def connection(self) -> Connection: ...
 -- 
-2.50.1
+2.51.0
 
diff --git a/mypy/typeshed/stdlib/_ast.pyi b/mypy/typeshed/stdlib/_ast.pyi
index 00c6b357f7d8..d8d5a1829991 100644
--- a/mypy/typeshed/stdlib/_ast.pyi
+++ b/mypy/typeshed/stdlib/_ast.pyi
@@ -108,7 +108,7 @@ from ast import (
     unaryop as unaryop,
     withitem as withitem,
 )
-from typing import Literal
+from typing import Final
 
 if sys.version_info >= (3, 12):
     from ast import (
@@ -137,9 +137,9 @@ if sys.version_info >= (3, 10):
         pattern as pattern,
     )
 
-PyCF_ALLOW_TOP_LEVEL_AWAIT: Literal[8192]
-PyCF_ONLY_AST: Literal[1024]
-PyCF_TYPE_COMMENTS: Literal[4096]
+PyCF_ALLOW_TOP_LEVEL_AWAIT: Final = 8192
+PyCF_ONLY_AST: Final = 1024
+PyCF_TYPE_COMMENTS: Final = 4096
 
 if sys.version_info >= (3, 13):
-    PyCF_OPTIMIZED_AST: Literal[33792]
+    PyCF_OPTIMIZED_AST: Final = 33792
diff --git a/mypy/typeshed/stdlib/_asyncio.pyi b/mypy/typeshed/stdlib/_asyncio.pyi
index 5253e967e5a3..f43178e4d725 100644
--- a/mypy/typeshed/stdlib/_asyncio.pyi
+++ b/mypy/typeshed/stdlib/_asyncio.pyi
@@ -4,12 +4,13 @@ from collections.abc import Awaitable, Callable, Coroutine, Generator, Iterable
 from contextvars import Context
 from types import FrameType, GenericAlias
 from typing import Any, Literal, TextIO, TypeVar
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 _T = TypeVar("_T")
 _T_co = TypeVar("_T_co", covariant=True)
 _TaskYieldType: TypeAlias = Future[object] | None
 
+@disjoint_base
 class Future(Awaitable[_T], Iterable[_T]):
     _state: str
     @property
@@ -20,7 +21,7 @@ class Future(Awaitable[_T], Iterable[_T]):
     @_log_traceback.setter
     def _log_traceback(self, val: Literal[False]) -> None: ...
     _asyncio_future_blocking: bool  # is a part of duck-typing contract for `Future`
-    def __init__(self, *, loop: AbstractEventLoop | None = ...) -> None: ...
+    def __init__(self, *, loop: AbstractEventLoop | None = None) -> None: ...
     def __del__(self) -> None: ...
     def get_loop(self) -> AbstractEventLoop: ...
     @property
@@ -49,6 +50,7 @@ else:
 # While this is true in general, here it's sort-of okay to have a covariant subclass,
 # since the only reason why `asyncio.Future` is invariant is the `set_result()` method,
 # and `asyncio.Task.set_result()` always raises.
+@disjoint_base
 class Task(Future[_T_co]):  # type: ignore[type-var]  # pyright: ignore[reportInvalidTypeArguments]
     if sys.version_info >= (3, 12):
         def __init__(
@@ -56,7 +58,7 @@ class Task(Future[_T_co]):  # type: ignore[type-var]  # pyright: ignore[reportIn
             coro: _TaskCompatibleCoro[_T_co],
             *,
             loop: AbstractEventLoop | None = None,
-            name: str | None = ...,
+            name: str | None = None,
             context: Context | None = None,
             eager_start: bool = False,
         ) -> None: ...
@@ -66,12 +68,12 @@ class Task(Future[_T_co]):  # type: ignore[type-var]  # pyright: ignore[reportIn
             coro: _TaskCompatibleCoro[_T_co],
             *,
             loop: AbstractEventLoop | None = None,
-            name: str | None = ...,
+            name: str | None = None,
             context: Context | None = None,
         ) -> None: ...
     else:
         def __init__(
-            self, coro: _TaskCompatibleCoro[_T_co], *, loop: AbstractEventLoop | None = None, name: str | None = ...
+            self, coro: _TaskCompatibleCoro[_T_co], *, loop: AbstractEventLoop | None = None, name: str | None = None
         ) -> None: ...
 
     if sys.version_info >= (3, 12):
diff --git a/mypy/typeshed/stdlib/_blake2.pyi b/mypy/typeshed/stdlib/_blake2.pyi
index d578df55c2fa..a6c3869fb851 100644
--- a/mypy/typeshed/stdlib/_blake2.pyi
+++ b/mypy/typeshed/stdlib/_blake2.pyi
@@ -1,15 +1,16 @@
+import sys
 from _typeshed import ReadableBuffer
-from typing import ClassVar, final
+from typing import ClassVar, Final, final
 from typing_extensions import Self
 
-BLAKE2B_MAX_DIGEST_SIZE: int = 64
-BLAKE2B_MAX_KEY_SIZE: int = 64
-BLAKE2B_PERSON_SIZE: int = 16
-BLAKE2B_SALT_SIZE: int = 16
-BLAKE2S_MAX_DIGEST_SIZE: int = 32
-BLAKE2S_MAX_KEY_SIZE: int = 32
-BLAKE2S_PERSON_SIZE: int = 8
-BLAKE2S_SALT_SIZE: int = 8
+BLAKE2B_MAX_DIGEST_SIZE: Final = 64
+BLAKE2B_MAX_KEY_SIZE: Final = 64
+BLAKE2B_PERSON_SIZE: Final = 16
+BLAKE2B_SALT_SIZE: Final = 16
+BLAKE2S_MAX_DIGEST_SIZE: Final = 32
+BLAKE2S_MAX_KEY_SIZE: Final = 32
+BLAKE2S_PERSON_SIZE: Final = 8
+BLAKE2S_SALT_SIZE: Final = 8
 
 @final
 class blake2b:
@@ -20,24 +21,45 @@ class blake2b:
     block_size: int
     digest_size: int
     name: str
-    def __new__(
-        cls,
-        data: ReadableBuffer = b"",
-        /,
-        *,
-        digest_size: int = 64,
-        key: ReadableBuffer = b"",
-        salt: ReadableBuffer = b"",
-        person: ReadableBuffer = b"",
-        fanout: int = 1,
-        depth: int = 1,
-        leaf_size: int = 0,
-        node_offset: int = 0,
-        node_depth: int = 0,
-        inner_size: int = 0,
-        last_node: bool = False,
-        usedforsecurity: bool = True,
-    ) -> Self: ...
+    if sys.version_info >= (3, 13):
+        def __new__(
+            cls,
+            data: ReadableBuffer = b"",
+            *,
+            digest_size: int = 64,
+            key: ReadableBuffer = b"",
+            salt: ReadableBuffer = b"",
+            person: ReadableBuffer = b"",
+            fanout: int = 1,
+            depth: int = 1,
+            leaf_size: int = 0,
+            node_offset: int = 0,
+            node_depth: int = 0,
+            inner_size: int = 0,
+            last_node: bool = False,
+            usedforsecurity: bool = True,
+            string: ReadableBuffer | None = None,
+        ) -> Self: ...
+    else:
+        def __new__(
+            cls,
+            data: ReadableBuffer = b"",
+            /,
+            *,
+            digest_size: int = 64,
+            key: ReadableBuffer = b"",
+            salt: ReadableBuffer = b"",
+            person: ReadableBuffer = b"",
+            fanout: int = 1,
+            depth: int = 1,
+            leaf_size: int = 0,
+            node_offset: int = 0,
+            node_depth: int = 0,
+            inner_size: int = 0,
+            last_node: bool = False,
+            usedforsecurity: bool = True,
+        ) -> Self: ...
+
     def copy(self) -> Self: ...
     def digest(self) -> bytes: ...
     def hexdigest(self) -> str: ...
@@ -52,24 +74,45 @@ class blake2s:
     block_size: int
     digest_size: int
     name: str
-    def __new__(
-        cls,
-        data: ReadableBuffer = b"",
-        /,
-        *,
-        digest_size: int = 32,
-        key: ReadableBuffer = b"",
-        salt: ReadableBuffer = b"",
-        person: ReadableBuffer = b"",
-        fanout: int = 1,
-        depth: int = 1,
-        leaf_size: int = 0,
-        node_offset: int = 0,
-        node_depth: int = 0,
-        inner_size: int = 0,
-        last_node: bool = False,
-        usedforsecurity: bool = True,
-    ) -> Self: ...
+    if sys.version_info >= (3, 13):
+        def __new__(
+            cls,
+            data: ReadableBuffer = b"",
+            *,
+            digest_size: int = 32,
+            key: ReadableBuffer = b"",
+            salt: ReadableBuffer = b"",
+            person: ReadableBuffer = b"",
+            fanout: int = 1,
+            depth: int = 1,
+            leaf_size: int = 0,
+            node_offset: int = 0,
+            node_depth: int = 0,
+            inner_size: int = 0,
+            last_node: bool = False,
+            usedforsecurity: bool = True,
+            string: ReadableBuffer | None = None,
+        ) -> Self: ...
+    else:
+        def __new__(
+            cls,
+            data: ReadableBuffer = b"",
+            /,
+            *,
+            digest_size: int = 32,
+            key: ReadableBuffer = b"",
+            salt: ReadableBuffer = b"",
+            person: ReadableBuffer = b"",
+            fanout: int = 1,
+            depth: int = 1,
+            leaf_size: int = 0,
+            node_offset: int = 0,
+            node_depth: int = 0,
+            inner_size: int = 0,
+            last_node: bool = False,
+            usedforsecurity: bool = True,
+        ) -> Self: ...
+
     def copy(self) -> Self: ...
     def digest(self) -> bytes: ...
     def hexdigest(self) -> str: ...
diff --git a/mypy/typeshed/stdlib/_collections_abc.pyi b/mypy/typeshed/stdlib/_collections_abc.pyi
index b099bdd98f3c..c63606a13ca9 100644
--- a/mypy/typeshed/stdlib/_collections_abc.pyi
+++ b/mypy/typeshed/stdlib/_collections_abc.pyi
@@ -103,5 +103,6 @@ class dict_items(ItemsView[_KT_co, _VT_co]):  # undocumented
 if sys.version_info >= (3, 12):
     @runtime_checkable
     class Buffer(Protocol):
+        __slots__ = ()
         @abstractmethod
         def __buffer__(self, flags: int, /) -> memoryview: ...
diff --git a/mypy/typeshed/stdlib/_compat_pickle.pyi b/mypy/typeshed/stdlib/_compat_pickle.pyi
index 50fb22442cc9..32c0b542d991 100644
--- a/mypy/typeshed/stdlib/_compat_pickle.pyi
+++ b/mypy/typeshed/stdlib/_compat_pickle.pyi
@@ -1,8 +1,10 @@
-IMPORT_MAPPING: dict[str, str]
-NAME_MAPPING: dict[tuple[str, str], tuple[str, str]]
-PYTHON2_EXCEPTIONS: tuple[str, ...]
-MULTIPROCESSING_EXCEPTIONS: tuple[str, ...]
-REVERSE_IMPORT_MAPPING: dict[str, str]
-REVERSE_NAME_MAPPING: dict[tuple[str, str], tuple[str, str]]
-PYTHON3_OSERROR_EXCEPTIONS: tuple[str, ...]
-PYTHON3_IMPORTERROR_EXCEPTIONS: tuple[str, ...]
+from typing import Final
+
+IMPORT_MAPPING: Final[dict[str, str]]
+NAME_MAPPING: Final[dict[tuple[str, str], tuple[str, str]]]
+PYTHON2_EXCEPTIONS: Final[tuple[str, ...]]
+MULTIPROCESSING_EXCEPTIONS: Final[tuple[str, ...]]
+REVERSE_IMPORT_MAPPING: Final[dict[str, str]]
+REVERSE_NAME_MAPPING: Final[dict[tuple[str, str], tuple[str, str]]]
+PYTHON3_OSERROR_EXCEPTIONS: Final[tuple[str, ...]]
+PYTHON3_IMPORTERROR_EXCEPTIONS: Final[tuple[str, ...]]
diff --git a/mypy/typeshed/stdlib/_csv.pyi b/mypy/typeshed/stdlib/_csv.pyi
index efe9ad69bd31..4128178c18b3 100644
--- a/mypy/typeshed/stdlib/_csv.pyi
+++ b/mypy/typeshed/stdlib/_csv.pyi
@@ -3,7 +3,7 @@ import sys
 from _typeshed import SupportsWrite
 from collections.abc import Iterable
 from typing import Any, Final, Literal, type_check_only
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 __version__: Final[str]
 
@@ -24,6 +24,7 @@ class Error(Exception): ...
 
 _DialectLike: TypeAlias = str | Dialect | csv.Dialect | type[Dialect | csv.Dialect]
 
+@disjoint_base
 class Dialect:
     delimiter: str
     quotechar: str | None
@@ -35,7 +36,7 @@ class Dialect:
     strict: bool
     def __new__(
         cls,
-        dialect: _DialectLike | None = ...,
+        dialect: _DialectLike | None = None,
         delimiter: str = ",",
         doublequote: bool = True,
         escapechar: str | None = None,
@@ -48,6 +49,7 @@ class Dialect:
 
 if sys.version_info >= (3, 10):
     # This class calls itself _csv.reader.
+    @disjoint_base
     class Reader:
         @property
         def dialect(self) -> Dialect: ...
@@ -56,6 +58,7 @@ if sys.version_info >= (3, 10):
         def __next__(self) -> list[str]: ...
 
     # This class calls itself _csv.writer.
+    @disjoint_base
     class Writer:
         @property
         def dialect(self) -> Dialect: ...
diff --git a/mypy/typeshed/stdlib/_ctypes.pyi b/mypy/typeshed/stdlib/_ctypes.pyi
index bfd0f910f482..082a31f70562 100644
--- a/mypy/typeshed/stdlib/_ctypes.pyi
+++ b/mypy/typeshed/stdlib/_ctypes.pyi
@@ -5,24 +5,24 @@ from abc import abstractmethod
 from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
 from ctypes import CDLL, ArgumentError as ArgumentError, c_void_p
 from types import GenericAlias
-from typing import Any, ClassVar, Generic, TypeVar, final, overload, type_check_only
+from typing import Any, ClassVar, Final, Generic, TypeVar, final, overload, type_check_only
 from typing_extensions import Self, TypeAlias
 
 _T = TypeVar("_T")
 _CT = TypeVar("_CT", bound=_CData)
 
-FUNCFLAG_CDECL: int
-FUNCFLAG_PYTHONAPI: int
-FUNCFLAG_USE_ERRNO: int
-FUNCFLAG_USE_LASTERROR: int
-RTLD_GLOBAL: int
-RTLD_LOCAL: int
+FUNCFLAG_CDECL: Final = 0x1
+FUNCFLAG_PYTHONAPI: Final = 0x4
+FUNCFLAG_USE_ERRNO: Final = 0x8
+FUNCFLAG_USE_LASTERROR: Final = 0x10
+RTLD_GLOBAL: Final[int]
+RTLD_LOCAL: Final[int]
 
 if sys.version_info >= (3, 11):
-    CTYPES_MAX_ARGCOUNT: int
+    CTYPES_MAX_ARGCOUNT: Final[int]
 
 if sys.version_info >= (3, 12):
-    SIZEOF_TIME_T: int
+    SIZEOF_TIME_T: Final[int]
 
 if sys.platform == "win32":
     # Description, Source, HelpFile, HelpContext, scode
@@ -37,8 +37,8 @@ if sys.platform == "win32":
 
     def CopyComPointer(src: _PointerLike, dst: _PointerLike | _CArgObject) -> int: ...
 
-    FUNCFLAG_HRESULT: int
-    FUNCFLAG_STDCALL: int
+    FUNCFLAG_HRESULT: Final = 0x2
+    FUNCFLAG_STDCALL: Final = 0x0
 
     def FormatError(code: int = ...) -> str: ...
     def get_last_error() -> int: ...
diff --git a/mypy/typeshed/stdlib/_curses.pyi b/mypy/typeshed/stdlib/_curses.pyi
index f21a9ca60270..d4e4d48f4e20 100644
--- a/mypy/typeshed/stdlib/_curses.pyi
+++ b/mypy/typeshed/stdlib/_curses.pyi
@@ -1,7 +1,7 @@
 import sys
 from _typeshed import ReadOnlyBuffer, SupportsRead, SupportsWrite
 from curses import _ncurses_version
-from typing import Any, final, overload
+from typing import Any, Final, final, overload
 from typing_extensions import TypeAlias
 
 # NOTE: This module is ordinarily only available on Unix, but the windows-curses
@@ -11,270 +11,270 @@ from typing_extensions import TypeAlias
 _ChType: TypeAlias = str | bytes | int
 
 # ACS codes are only initialized after initscr is called
-ACS_BBSS: int
-ACS_BLOCK: int
-ACS_BOARD: int
-ACS_BSBS: int
-ACS_BSSB: int
-ACS_BSSS: int
-ACS_BTEE: int
-ACS_BULLET: int
-ACS_CKBOARD: int
-ACS_DARROW: int
-ACS_DEGREE: int
-ACS_DIAMOND: int
-ACS_GEQUAL: int
-ACS_HLINE: int
-ACS_LANTERN: int
-ACS_LARROW: int
-ACS_LEQUAL: int
-ACS_LLCORNER: int
-ACS_LRCORNER: int
-ACS_LTEE: int
-ACS_NEQUAL: int
-ACS_PI: int
-ACS_PLMINUS: int
-ACS_PLUS: int
-ACS_RARROW: int
-ACS_RTEE: int
-ACS_S1: int
-ACS_S3: int
-ACS_S7: int
-ACS_S9: int
-ACS_SBBS: int
-ACS_SBSB: int
-ACS_SBSS: int
-ACS_SSBB: int
-ACS_SSBS: int
-ACS_SSSB: int
-ACS_SSSS: int
-ACS_STERLING: int
-ACS_TTEE: int
-ACS_UARROW: int
-ACS_ULCORNER: int
-ACS_URCORNER: int
-ACS_VLINE: int
-ALL_MOUSE_EVENTS: int
-A_ALTCHARSET: int
-A_ATTRIBUTES: int
-A_BLINK: int
-A_BOLD: int
-A_CHARTEXT: int
-A_COLOR: int
-A_DIM: int
-A_HORIZONTAL: int
-A_INVIS: int
-A_ITALIC: int
-A_LEFT: int
-A_LOW: int
-A_NORMAL: int
-A_PROTECT: int
-A_REVERSE: int
-A_RIGHT: int
-A_STANDOUT: int
-A_TOP: int
-A_UNDERLINE: int
-A_VERTICAL: int
-BUTTON1_CLICKED: int
-BUTTON1_DOUBLE_CLICKED: int
-BUTTON1_PRESSED: int
-BUTTON1_RELEASED: int
-BUTTON1_TRIPLE_CLICKED: int
-BUTTON2_CLICKED: int
-BUTTON2_DOUBLE_CLICKED: int
-BUTTON2_PRESSED: int
-BUTTON2_RELEASED: int
-BUTTON2_TRIPLE_CLICKED: int
-BUTTON3_CLICKED: int
-BUTTON3_DOUBLE_CLICKED: int
-BUTTON3_PRESSED: int
-BUTTON3_RELEASED: int
-BUTTON3_TRIPLE_CLICKED: int
-BUTTON4_CLICKED: int
-BUTTON4_DOUBLE_CLICKED: int
-BUTTON4_PRESSED: int
-BUTTON4_RELEASED: int
-BUTTON4_TRIPLE_CLICKED: int
+ACS_BBSS: Final[int]
+ACS_BLOCK: Final[int]
+ACS_BOARD: Final[int]
+ACS_BSBS: Final[int]
+ACS_BSSB: Final[int]
+ACS_BSSS: Final[int]
+ACS_BTEE: Final[int]
+ACS_BULLET: Final[int]
+ACS_CKBOARD: Final[int]
+ACS_DARROW: Final[int]
+ACS_DEGREE: Final[int]
+ACS_DIAMOND: Final[int]
+ACS_GEQUAL: Final[int]
+ACS_HLINE: Final[int]
+ACS_LANTERN: Final[int]
+ACS_LARROW: Final[int]
+ACS_LEQUAL: Final[int]
+ACS_LLCORNER: Final[int]
+ACS_LRCORNER: Final[int]
+ACS_LTEE: Final[int]
+ACS_NEQUAL: Final[int]
+ACS_PI: Final[int]
+ACS_PLMINUS: Final[int]
+ACS_PLUS: Final[int]
+ACS_RARROW: Final[int]
+ACS_RTEE: Final[int]
+ACS_S1: Final[int]
+ACS_S3: Final[int]
+ACS_S7: Final[int]
+ACS_S9: Final[int]
+ACS_SBBS: Final[int]
+ACS_SBSB: Final[int]
+ACS_SBSS: Final[int]
+ACS_SSBB: Final[int]
+ACS_SSBS: Final[int]
+ACS_SSSB: Final[int]
+ACS_SSSS: Final[int]
+ACS_STERLING: Final[int]
+ACS_TTEE: Final[int]
+ACS_UARROW: Final[int]
+ACS_ULCORNER: Final[int]
+ACS_URCORNER: Final[int]
+ACS_VLINE: Final[int]
+ALL_MOUSE_EVENTS: Final[int]
+A_ALTCHARSET: Final[int]
+A_ATTRIBUTES: Final[int]
+A_BLINK: Final[int]
+A_BOLD: Final[int]
+A_CHARTEXT: Final[int]
+A_COLOR: Final[int]
+A_DIM: Final[int]
+A_HORIZONTAL: Final[int]
+A_INVIS: Final[int]
+A_ITALIC: Final[int]
+A_LEFT: Final[int]
+A_LOW: Final[int]
+A_NORMAL: Final[int]
+A_PROTECT: Final[int]
+A_REVERSE: Final[int]
+A_RIGHT: Final[int]
+A_STANDOUT: Final[int]
+A_TOP: Final[int]
+A_UNDERLINE: Final[int]
+A_VERTICAL: Final[int]
+BUTTON1_CLICKED: Final[int]
+BUTTON1_DOUBLE_CLICKED: Final[int]
+BUTTON1_PRESSED: Final[int]
+BUTTON1_RELEASED: Final[int]
+BUTTON1_TRIPLE_CLICKED: Final[int]
+BUTTON2_CLICKED: Final[int]
+BUTTON2_DOUBLE_CLICKED: Final[int]
+BUTTON2_PRESSED: Final[int]
+BUTTON2_RELEASED: Final[int]
+BUTTON2_TRIPLE_CLICKED: Final[int]
+BUTTON3_CLICKED: Final[int]
+BUTTON3_DOUBLE_CLICKED: Final[int]
+BUTTON3_PRESSED: Final[int]
+BUTTON3_RELEASED: Final[int]
+BUTTON3_TRIPLE_CLICKED: Final[int]
+BUTTON4_CLICKED: Final[int]
+BUTTON4_DOUBLE_CLICKED: Final[int]
+BUTTON4_PRESSED: Final[int]
+BUTTON4_RELEASED: Final[int]
+BUTTON4_TRIPLE_CLICKED: Final[int]
 # Darwin ncurses doesn't provide BUTTON5_* constants prior to 3.12.10 and 3.13.3
 if sys.version_info >= (3, 10):
     if sys.version_info >= (3, 12) or sys.platform != "darwin":
-        BUTTON5_PRESSED: int
-        BUTTON5_RELEASED: int
-        BUTTON5_CLICKED: int
-        BUTTON5_DOUBLE_CLICKED: int
-        BUTTON5_TRIPLE_CLICKED: int
-BUTTON_ALT: int
-BUTTON_CTRL: int
-BUTTON_SHIFT: int
-COLOR_BLACK: int
-COLOR_BLUE: int
-COLOR_CYAN: int
-COLOR_GREEN: int
-COLOR_MAGENTA: int
-COLOR_RED: int
-COLOR_WHITE: int
-COLOR_YELLOW: int
-ERR: int
-KEY_A1: int
-KEY_A3: int
-KEY_B2: int
-KEY_BACKSPACE: int
-KEY_BEG: int
-KEY_BREAK: int
-KEY_BTAB: int
-KEY_C1: int
-KEY_C3: int
-KEY_CANCEL: int
-KEY_CATAB: int
-KEY_CLEAR: int
-KEY_CLOSE: int
-KEY_COMMAND: int
-KEY_COPY: int
-KEY_CREATE: int
-KEY_CTAB: int
-KEY_DC: int
-KEY_DL: int
-KEY_DOWN: int
-KEY_EIC: int
-KEY_END: int
-KEY_ENTER: int
-KEY_EOL: int
-KEY_EOS: int
-KEY_EXIT: int
-KEY_F0: int
-KEY_F1: int
-KEY_F10: int
-KEY_F11: int
-KEY_F12: int
-KEY_F13: int
-KEY_F14: int
-KEY_F15: int
-KEY_F16: int
-KEY_F17: int
-KEY_F18: int
-KEY_F19: int
-KEY_F2: int
-KEY_F20: int
-KEY_F21: int
-KEY_F22: int
-KEY_F23: int
-KEY_F24: int
-KEY_F25: int
-KEY_F26: int
-KEY_F27: int
-KEY_F28: int
-KEY_F29: int
-KEY_F3: int
-KEY_F30: int
-KEY_F31: int
-KEY_F32: int
-KEY_F33: int
-KEY_F34: int
-KEY_F35: int
-KEY_F36: int
-KEY_F37: int
-KEY_F38: int
-KEY_F39: int
-KEY_F4: int
-KEY_F40: int
-KEY_F41: int
-KEY_F42: int
-KEY_F43: int
-KEY_F44: int
-KEY_F45: int
-KEY_F46: int
-KEY_F47: int
-KEY_F48: int
-KEY_F49: int
-KEY_F5: int
-KEY_F50: int
-KEY_F51: int
-KEY_F52: int
-KEY_F53: int
-KEY_F54: int
-KEY_F55: int
-KEY_F56: int
-KEY_F57: int
-KEY_F58: int
-KEY_F59: int
-KEY_F6: int
-KEY_F60: int
-KEY_F61: int
-KEY_F62: int
-KEY_F63: int
-KEY_F7: int
-KEY_F8: int
-KEY_F9: int
-KEY_FIND: int
-KEY_HELP: int
-KEY_HOME: int
-KEY_IC: int
-KEY_IL: int
-KEY_LEFT: int
-KEY_LL: int
-KEY_MARK: int
-KEY_MAX: int
-KEY_MESSAGE: int
-KEY_MIN: int
-KEY_MOUSE: int
-KEY_MOVE: int
-KEY_NEXT: int
-KEY_NPAGE: int
-KEY_OPEN: int
-KEY_OPTIONS: int
-KEY_PPAGE: int
-KEY_PREVIOUS: int
-KEY_PRINT: int
-KEY_REDO: int
-KEY_REFERENCE: int
-KEY_REFRESH: int
-KEY_REPLACE: int
-KEY_RESET: int
-KEY_RESIZE: int
-KEY_RESTART: int
-KEY_RESUME: int
-KEY_RIGHT: int
-KEY_SAVE: int
-KEY_SBEG: int
-KEY_SCANCEL: int
-KEY_SCOMMAND: int
-KEY_SCOPY: int
-KEY_SCREATE: int
-KEY_SDC: int
-KEY_SDL: int
-KEY_SELECT: int
-KEY_SEND: int
-KEY_SEOL: int
-KEY_SEXIT: int
-KEY_SF: int
-KEY_SFIND: int
-KEY_SHELP: int
-KEY_SHOME: int
-KEY_SIC: int
-KEY_SLEFT: int
-KEY_SMESSAGE: int
-KEY_SMOVE: int
-KEY_SNEXT: int
-KEY_SOPTIONS: int
-KEY_SPREVIOUS: int
-KEY_SPRINT: int
-KEY_SR: int
-KEY_SREDO: int
-KEY_SREPLACE: int
-KEY_SRESET: int
-KEY_SRIGHT: int
-KEY_SRSUME: int
-KEY_SSAVE: int
-KEY_SSUSPEND: int
-KEY_STAB: int
-KEY_SUNDO: int
-KEY_SUSPEND: int
-KEY_UNDO: int
-KEY_UP: int
-OK: int
-REPORT_MOUSE_POSITION: int
+        BUTTON5_PRESSED: Final[int]
+        BUTTON5_RELEASED: Final[int]
+        BUTTON5_CLICKED: Final[int]
+        BUTTON5_DOUBLE_CLICKED: Final[int]
+        BUTTON5_TRIPLE_CLICKED: Final[int]
+BUTTON_ALT: Final[int]
+BUTTON_CTRL: Final[int]
+BUTTON_SHIFT: Final[int]
+COLOR_BLACK: Final[int]
+COLOR_BLUE: Final[int]
+COLOR_CYAN: Final[int]
+COLOR_GREEN: Final[int]
+COLOR_MAGENTA: Final[int]
+COLOR_RED: Final[int]
+COLOR_WHITE: Final[int]
+COLOR_YELLOW: Final[int]
+ERR: Final[int]
+KEY_A1: Final[int]
+KEY_A3: Final[int]
+KEY_B2: Final[int]
+KEY_BACKSPACE: Final[int]
+KEY_BEG: Final[int]
+KEY_BREAK: Final[int]
+KEY_BTAB: Final[int]
+KEY_C1: Final[int]
+KEY_C3: Final[int]
+KEY_CANCEL: Final[int]
+KEY_CATAB: Final[int]
+KEY_CLEAR: Final[int]
+KEY_CLOSE: Final[int]
+KEY_COMMAND: Final[int]
+KEY_COPY: Final[int]
+KEY_CREATE: Final[int]
+KEY_CTAB: Final[int]
+KEY_DC: Final[int]
+KEY_DL: Final[int]
+KEY_DOWN: Final[int]
+KEY_EIC: Final[int]
+KEY_END: Final[int]
+KEY_ENTER: Final[int]
+KEY_EOL: Final[int]
+KEY_EOS: Final[int]
+KEY_EXIT: Final[int]
+KEY_F0: Final[int]
+KEY_F1: Final[int]
+KEY_F10: Final[int]
+KEY_F11: Final[int]
+KEY_F12: Final[int]
+KEY_F13: Final[int]
+KEY_F14: Final[int]
+KEY_F15: Final[int]
+KEY_F16: Final[int]
+KEY_F17: Final[int]
+KEY_F18: Final[int]
+KEY_F19: Final[int]
+KEY_F2: Final[int]
+KEY_F20: Final[int]
+KEY_F21: Final[int]
+KEY_F22: Final[int]
+KEY_F23: Final[int]
+KEY_F24: Final[int]
+KEY_F25: Final[int]
+KEY_F26: Final[int]
+KEY_F27: Final[int]
+KEY_F28: Final[int]
+KEY_F29: Final[int]
+KEY_F3: Final[int]
+KEY_F30: Final[int]
+KEY_F31: Final[int]
+KEY_F32: Final[int]
+KEY_F33: Final[int]
+KEY_F34: Final[int]
+KEY_F35: Final[int]
+KEY_F36: Final[int]
+KEY_F37: Final[int]
+KEY_F38: Final[int]
+KEY_F39: Final[int]
+KEY_F4: Final[int]
+KEY_F40: Final[int]
+KEY_F41: Final[int]
+KEY_F42: Final[int]
+KEY_F43: Final[int]
+KEY_F44: Final[int]
+KEY_F45: Final[int]
+KEY_F46: Final[int]
+KEY_F47: Final[int]
+KEY_F48: Final[int]
+KEY_F49: Final[int]
+KEY_F5: Final[int]
+KEY_F50: Final[int]
+KEY_F51: Final[int]
+KEY_F52: Final[int]
+KEY_F53: Final[int]
+KEY_F54: Final[int]
+KEY_F55: Final[int]
+KEY_F56: Final[int]
+KEY_F57: Final[int]
+KEY_F58: Final[int]
+KEY_F59: Final[int]
+KEY_F6: Final[int]
+KEY_F60: Final[int]
+KEY_F61: Final[int]
+KEY_F62: Final[int]
+KEY_F63: Final[int]
+KEY_F7: Final[int]
+KEY_F8: Final[int]
+KEY_F9: Final[int]
+KEY_FIND: Final[int]
+KEY_HELP: Final[int]
+KEY_HOME: Final[int]
+KEY_IC: Final[int]
+KEY_IL: Final[int]
+KEY_LEFT: Final[int]
+KEY_LL: Final[int]
+KEY_MARK: Final[int]
+KEY_MAX: Final[int]
+KEY_MESSAGE: Final[int]
+KEY_MIN: Final[int]
+KEY_MOUSE: Final[int]
+KEY_MOVE: Final[int]
+KEY_NEXT: Final[int]
+KEY_NPAGE: Final[int]
+KEY_OPEN: Final[int]
+KEY_OPTIONS: Final[int]
+KEY_PPAGE: Final[int]
+KEY_PREVIOUS: Final[int]
+KEY_PRINT: Final[int]
+KEY_REDO: Final[int]
+KEY_REFERENCE: Final[int]
+KEY_REFRESH: Final[int]
+KEY_REPLACE: Final[int]
+KEY_RESET: Final[int]
+KEY_RESIZE: Final[int]
+KEY_RESTART: Final[int]
+KEY_RESUME: Final[int]
+KEY_RIGHT: Final[int]
+KEY_SAVE: Final[int]
+KEY_SBEG: Final[int]
+KEY_SCANCEL: Final[int]
+KEY_SCOMMAND: Final[int]
+KEY_SCOPY: Final[int]
+KEY_SCREATE: Final[int]
+KEY_SDC: Final[int]
+KEY_SDL: Final[int]
+KEY_SELECT: Final[int]
+KEY_SEND: Final[int]
+KEY_SEOL: Final[int]
+KEY_SEXIT: Final[int]
+KEY_SF: Final[int]
+KEY_SFIND: Final[int]
+KEY_SHELP: Final[int]
+KEY_SHOME: Final[int]
+KEY_SIC: Final[int]
+KEY_SLEFT: Final[int]
+KEY_SMESSAGE: Final[int]
+KEY_SMOVE: Final[int]
+KEY_SNEXT: Final[int]
+KEY_SOPTIONS: Final[int]
+KEY_SPREVIOUS: Final[int]
+KEY_SPRINT: Final[int]
+KEY_SR: Final[int]
+KEY_SREDO: Final[int]
+KEY_SREPLACE: Final[int]
+KEY_SRESET: Final[int]
+KEY_SRIGHT: Final[int]
+KEY_SRSUME: Final[int]
+KEY_SSAVE: Final[int]
+KEY_SSUSPEND: Final[int]
+KEY_STAB: Final[int]
+KEY_SUNDO: Final[int]
+KEY_SUSPEND: Final[int]
+KEY_UNDO: Final[int]
+KEY_UP: Final[int]
+OK: Final[int]
+REPORT_MOUSE_POSITION: Final[int]
 _C_API: Any
-version: bytes
+version: Final[bytes]
 
 def baudrate() -> int: ...
 def beep() -> None: ...
@@ -324,7 +324,7 @@ def mouseinterval(interval: int, /) -> None: ...
 def mousemask(newmask: int, /) -> tuple[int, int]: ...
 def napms(ms: int, /) -> int: ...
 def newpad(nlines: int, ncols: int, /) -> window: ...
-def newwin(nlines: int, ncols: int, begin_y: int = ..., begin_x: int = ..., /) -> window: ...
+def newwin(nlines: int, ncols: int, begin_y: int = 0, begin_x: int = 0, /) -> window: ...
 def nl(flag: bool = True, /) -> None: ...
 def nocbreak() -> None: ...
 def noecho() -> None: ...
@@ -394,8 +394,8 @@ class window:  # undocumented
     def attroff(self, attr: int, /) -> None: ...
     def attron(self, attr: int, /) -> None: ...
     def attrset(self, attr: int, /) -> None: ...
-    def bkgd(self, ch: _ChType, attr: int = ..., /) -> None: ...
-    def bkgdset(self, ch: _ChType, attr: int = ..., /) -> None: ...
+    def bkgd(self, ch: _ChType, attr: int = 0, /) -> None: ...
+    def bkgdset(self, ch: _ChType, attr: int = 0, /) -> None: ...
     def border(
         self,
         ls: _ChType = ...,
@@ -410,7 +410,7 @@ class window:  # undocumented
     @overload
     def box(self) -> None: ...
     @overload
-    def box(self, vertch: _ChType = ..., horch: _ChType = ...) -> None: ...
+    def box(self, vertch: _ChType = 0, horch: _ChType = 0) -> None: ...
     @overload
     def chgat(self, attr: int) -> None: ...
     @overload
@@ -433,7 +433,7 @@ class window:  # undocumented
     def derwin(self, begin_y: int, begin_x: int) -> window: ...
     @overload
     def derwin(self, nlines: int, ncols: int, begin_y: int, begin_x: int) -> window: ...
-    def echochar(self, ch: _ChType, attr: int = ..., /) -> None: ...
+    def echochar(self, ch: _ChType, attr: int = 0, /) -> None: ...
     def enclose(self, y: int, x: int, /) -> bool: ...
     def erase(self) -> None: ...
     def getbegyx(self) -> tuple[int, int]: ...
@@ -487,9 +487,9 @@ class window:  # undocumented
     @overload
     def insstr(self, y: int, x: int, str: str, attr: int = ...) -> None: ...
     @overload
-    def instr(self, n: int = ...) -> bytes: ...
+    def instr(self, n: int = 2047) -> bytes: ...
     @overload
-    def instr(self, y: int, x: int, n: int = ...) -> bytes: ...
+    def instr(self, y: int, x: int, n: int = 2047) -> bytes: ...
     def is_linetouched(self, line: int, /) -> bool: ...
     def is_wintouched(self) -> bool: ...
     def keypad(self, yes: bool, /) -> None: ...
@@ -523,7 +523,7 @@ class window:  # undocumented
     @overload
     def refresh(self, pminrow: int, pmincol: int, sminrow: int, smincol: int, smaxrow: int, smaxcol: int) -> None: ...
     def resize(self, nlines: int, ncols: int) -> None: ...
-    def scroll(self, lines: int = ...) -> None: ...
+    def scroll(self, lines: int = 1) -> None: ...
     def scrollok(self, flag: bool) -> None: ...
     def setscrreg(self, top: int, bottom: int, /) -> None: ...
     def standend(self) -> None: ...
@@ -540,7 +540,7 @@ class window:  # undocumented
     def syncok(self, flag: bool) -> None: ...
     def syncup(self) -> None: ...
     def timeout(self, delay: int) -> None: ...
-    def touchline(self, start: int, count: int, changed: bool = ...) -> None: ...
+    def touchline(self, start: int, count: int, changed: bool = True) -> None: ...
     def touchwin(self) -> None: ...
     def untouchwin(self) -> None: ...
     @overload
diff --git a/mypy/typeshed/stdlib/_curses_panel.pyi b/mypy/typeshed/stdlib/_curses_panel.pyi
index ddec22236b96..a552a151ddf1 100644
--- a/mypy/typeshed/stdlib/_curses_panel.pyi
+++ b/mypy/typeshed/stdlib/_curses_panel.pyi
@@ -1,8 +1,8 @@
 from _curses import window
-from typing import final
+from typing import Final, final
 
-__version__: str
-version: str
+__version__: Final[str]
+version: Final[str]
 
 class error(Exception): ...
 
diff --git a/mypy/typeshed/stdlib/_dbm.pyi b/mypy/typeshed/stdlib/_dbm.pyi
index 7e53cca3c704..222c3ffcb246 100644
--- a/mypy/typeshed/stdlib/_dbm.pyi
+++ b/mypy/typeshed/stdlib/_dbm.pyi
@@ -1,7 +1,7 @@
 import sys
 from _typeshed import ReadOnlyBuffer, StrOrBytesPath
 from types import TracebackType
-from typing import TypeVar, final, overload, type_check_only
+from typing import Final, TypeVar, final, overload, type_check_only
 from typing_extensions import Self, TypeAlias
 
 if sys.platform != "win32":
@@ -10,7 +10,7 @@ if sys.platform != "win32":
     _ValueType: TypeAlias = str | ReadOnlyBuffer
 
     class error(OSError): ...
-    library: str
+    library: Final[str]
 
     # Actual typename dbm, not exposed by the implementation
     @final
@@ -33,7 +33,7 @@ if sys.platform != "win32":
         @overload
         def get(self, k: _KeyType, default: _T, /) -> bytes | _T: ...
         def keys(self) -> list[bytes]: ...
-        def setdefault(self, k: _KeyType, default: _ValueType = ..., /) -> bytes: ...
+        def setdefault(self, k: _KeyType, default: _ValueType = b"", /) -> bytes: ...
         # This isn't true, but the class can't be instantiated. See #13024
         __new__: None  # type: ignore[assignment]
         __init__: None  # type: ignore[assignment]
diff --git a/mypy/typeshed/stdlib/_decimal.pyi b/mypy/typeshed/stdlib/_decimal.pyi
index fd0e6e6ac091..3cfe8944dfaf 100644
--- a/mypy/typeshed/stdlib/_decimal.pyi
+++ b/mypy/typeshed/stdlib/_decimal.pyi
@@ -51,14 +51,14 @@ if sys.version_info >= (3, 11):
     def localcontext(
         ctx: Context | None = None,
         *,
-        prec: int | None = ...,
-        rounding: str | None = ...,
-        Emin: int | None = ...,
-        Emax: int | None = ...,
-        capitals: int | None = ...,
-        clamp: int | None = ...,
-        traps: dict[_TrapType, bool] | None = ...,
-        flags: dict[_TrapType, bool] | None = ...,
+        prec: int | None = None,
+        rounding: str | None = None,
+        Emin: int | None = None,
+        Emax: int | None = None,
+        capitals: int | None = None,
+        clamp: int | None = None,
+        traps: dict[_TrapType, bool] | None = None,
+        flags: dict[_TrapType, bool] | None = None,
     ) -> _ContextManager: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/_frozen_importlib_external.pyi b/mypy/typeshed/stdlib/_frozen_importlib_external.pyi
index 80eebe45a7d4..71642c65dc07 100644
--- a/mypy/typeshed/stdlib/_frozen_importlib_external.pyi
+++ b/mypy/typeshed/stdlib/_frozen_importlib_external.pyi
@@ -9,7 +9,7 @@ from _typeshed.importlib import LoaderProtocol
 from collections.abc import Callable, Iterable, Iterator, Mapping, MutableSequence, Sequence
 from importlib.machinery import ModuleSpec
 from importlib.metadata import DistributionFinder, PathDistribution
-from typing import Any, Literal
+from typing import Any, Final, Literal
 from typing_extensions import Self, deprecated
 
 if sys.version_info >= (3, 10):
@@ -24,7 +24,7 @@ else:
     path_sep: Literal["/"]
     path_sep_tuple: tuple[Literal["/"]]
 
-MAGIC_NUMBER: bytes
+MAGIC_NUMBER: Final[bytes]
 
 def cache_from_source(path: StrPath, debug_override: bool | None = None, *, optimization: Any | None = None) -> str: ...
 def source_from_cache(path: StrPath) -> str: ...
@@ -37,7 +37,7 @@ def spec_from_file_location(
     submodule_search_locations: list[str] | None = ...,
 ) -> importlib.machinery.ModuleSpec | None: ...
 @deprecated(
-    "Deprecated as of Python 3.6: Use site configuration instead. "
+    "Deprecated since Python 3.6. Use site configuration instead. "
     "Future versions of Python may not enable this finder by default."
 )
 class WindowsRegistryFinder(importlib.abc.MetaPathFinder):
@@ -74,11 +74,11 @@ class PathFinder(importlib.abc.MetaPathFinder):
         @deprecated("Deprecated since Python 3.4; removed in Python 3.12. Use `find_spec()` instead.")
         def find_module(cls, fullname: str, path: Sequence[str] | None = None) -> importlib.abc.Loader | None: ...
 
-SOURCE_SUFFIXES: list[str]
-DEBUG_BYTECODE_SUFFIXES: list[str]
-OPTIMIZED_BYTECODE_SUFFIXES: list[str]
-BYTECODE_SUFFIXES: list[str]
-EXTENSION_SUFFIXES: list[str]
+SOURCE_SUFFIXES: Final[list[str]]
+DEBUG_BYTECODE_SUFFIXES: Final = [".pyc"]
+OPTIMIZED_BYTECODE_SUFFIXES: Final = [".pyc"]
+BYTECODE_SUFFIXES: Final = [".pyc"]
+EXTENSION_SUFFIXES: Final[list[str]]
 
 class FileFinder(importlib.abc.PathEntryFinder):
     path: str
@@ -155,7 +155,7 @@ if sys.version_info >= (3, 11):
         def get_code(self, fullname: str) -> types.CodeType: ...
         def create_module(self, spec: ModuleSpec) -> None: ...
         def exec_module(self, module: types.ModuleType) -> None: ...
-        @deprecated("load_module() is deprecated; use exec_module() instead")
+        @deprecated("Deprecated since Python 3.10; will be removed in Python 3.15. Use `exec_module()` instead.")
         def load_module(self, fullname: str) -> types.ModuleType: ...
         def get_resource_reader(self, module: types.ModuleType) -> importlib.readers.NamespaceReader: ...
         if sys.version_info < (3, 12):
@@ -177,9 +177,9 @@ else:
         def get_code(self, fullname: str) -> types.CodeType: ...
         def create_module(self, spec: ModuleSpec) -> None: ...
         def exec_module(self, module: types.ModuleType) -> None: ...
-        @deprecated("load_module() is deprecated; use exec_module() instead")
-        def load_module(self, fullname: str) -> types.ModuleType: ...
         if sys.version_info >= (3, 10):
+            @deprecated("Deprecated since Python 3.10; will be removed in Python 3.15. Use `exec_module()` instead.")
+            def load_module(self, fullname: str) -> types.ModuleType: ...
             @staticmethod
             @deprecated(
                 "Deprecated since Python 3.4; removed in Python 3.12. "
@@ -188,6 +188,7 @@ else:
             def module_repr(module: types.ModuleType) -> str: ...
             def get_resource_reader(self, module: types.ModuleType) -> importlib.readers.NamespaceReader: ...
         else:
+            def load_module(self, fullname: str) -> types.ModuleType: ...
             @classmethod
             @deprecated(
                 "Deprecated since Python 3.4; removed in Python 3.12. "
diff --git a/mypy/typeshed/stdlib/_hashlib.pyi b/mypy/typeshed/stdlib/_hashlib.pyi
index 8b7ef52cdffd..03c1eef3be3f 100644
--- a/mypy/typeshed/stdlib/_hashlib.pyi
+++ b/mypy/typeshed/stdlib/_hashlib.pyi
@@ -3,7 +3,7 @@ from _typeshed import ReadableBuffer
 from collections.abc import Callable
 from types import ModuleType
 from typing import AnyStr, Protocol, final, overload, type_check_only
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 _DigestMod: TypeAlias = str | Callable[[], _HashObject] | ModuleType | None
 
@@ -22,6 +22,7 @@ class _HashObject(Protocol):
     def hexdigest(self) -> str: ...
     def update(self, obj: ReadableBuffer, /) -> None: ...
 
+@disjoint_base
 class HASH:
     @property
     def digest_size(self) -> int: ...
diff --git a/mypy/typeshed/stdlib/_interpreters.pyi b/mypy/typeshed/stdlib/_interpreters.pyi
index f89a24e7d85c..8e097efad618 100644
--- a/mypy/typeshed/stdlib/_interpreters.pyi
+++ b/mypy/typeshed/stdlib/_interpreters.pyi
@@ -1,7 +1,7 @@
 import types
 from collections.abc import Callable
-from typing import Any, Final, Literal, SupportsIndex, TypeVar
-from typing_extensions import TypeAlias
+from typing import Any, Final, Literal, SupportsIndex, TypeVar, overload
+from typing_extensions import TypeAlias, disjoint_base
 
 _R = TypeVar("_R")
 
@@ -12,48 +12,45 @@ class InterpreterError(Exception): ...
 class InterpreterNotFoundError(InterpreterError): ...
 class NotShareableError(ValueError): ...
 
+@disjoint_base
 class CrossInterpreterBufferView:
     def __buffer__(self, flags: int, /) -> memoryview: ...
 
 def new_config(name: _Configs = "isolated", /, **overides: object) -> types.SimpleNamespace: ...
 def create(config: types.SimpleNamespace | _Configs | None = "isolated", *, reqrefs: bool = False) -> int: ...
 def destroy(id: SupportsIndex, *, restrict: bool = False) -> None: ...
-def list_all(*, require_ready: bool) -> list[tuple[int, int]]: ...
-def get_current() -> tuple[int, int]: ...
-def get_main() -> tuple[int, int]: ...
+def list_all(*, require_ready: bool = False) -> list[tuple[int, _Whence]]: ...
+def get_current() -> tuple[int, _Whence]: ...
+def get_main() -> tuple[int, _Whence]: ...
 def is_running(id: SupportsIndex, *, restrict: bool = False) -> bool: ...
 def get_config(id: SupportsIndex, *, restrict: bool = False) -> types.SimpleNamespace: ...
 def whence(id: SupportsIndex) -> _Whence: ...
 def exec(
-    id: SupportsIndex,
-    code: str | types.CodeType | Callable[[], object],
-    shared: _SharedDict | None = None,
-    *,
-    restrict: bool = False,
+    id: SupportsIndex, code: str | types.CodeType | Callable[[], object], shared: _SharedDict = {}, *, restrict: bool = False
 ) -> None | types.SimpleNamespace: ...
 def call(
     id: SupportsIndex,
     callable: Callable[..., _R],
-    args: tuple[Any, ...] | None = None,
-    kwargs: dict[str, Any] | None = None,
+    args: tuple[Any, ...] = (),
+    kwargs: dict[str, Any] = {},
     *,
+    preserve_exc: bool = False,
     restrict: bool = False,
 ) -> tuple[_R, types.SimpleNamespace]: ...
 def run_string(
-    id: SupportsIndex,
-    script: str | types.CodeType | Callable[[], object],
-    shared: _SharedDict | None = None,
-    *,
-    restrict: bool = False,
+    id: SupportsIndex, script: str | types.CodeType | Callable[[], object], shared: _SharedDict = {}, *, restrict: bool = False
 ) -> None: ...
 def run_func(
-    id: SupportsIndex, func: types.CodeType | Callable[[], object], shared: _SharedDict | None = None, *, restrict: bool = False
+    id: SupportsIndex, func: types.CodeType | Callable[[], object], shared: _SharedDict = {}, *, restrict: bool = False
 ) -> None: ...
 def set___main___attrs(id: SupportsIndex, updates: _SharedDict, *, restrict: bool = False) -> None: ...
 def incref(id: SupportsIndex, *, implieslink: bool = False, restrict: bool = False) -> None: ...
 def decref(id: SupportsIndex, *, restrict: bool = False) -> None: ...
 def is_shareable(obj: object) -> bool: ...
-def capture_exception(exc: BaseException | None = None) -> types.SimpleNamespace: ...
+@overload
+def capture_exception(exc: BaseException) -> types.SimpleNamespace: ...
+@overload
+def capture_exception(exc: None = None) -> types.SimpleNamespace | None: ...
 
 _Whence: TypeAlias = Literal[0, 1, 2, 3, 4, 5]
 WHENCE_UNKNOWN: Final = 0
diff --git a/mypy/typeshed/stdlib/_io.pyi b/mypy/typeshed/stdlib/_io.pyi
index e368ddef7f4e..2d2a60e4dddf 100644
--- a/mypy/typeshed/stdlib/_io.pyi
+++ b/mypy/typeshed/stdlib/_io.pyi
@@ -7,11 +7,14 @@ from io import BufferedIOBase, RawIOBase, TextIOBase, UnsupportedOperation as Un
 from os import _Opener
 from types import TracebackType
 from typing import IO, Any, BinaryIO, Final, Generic, Literal, Protocol, TextIO, TypeVar, overload, type_check_only
-from typing_extensions import Self
+from typing_extensions import Self, disjoint_base
 
 _T = TypeVar("_T")
 
-DEFAULT_BUFFER_SIZE: Final = 8192
+if sys.version_info >= (3, 14):
+    DEFAULT_BUFFER_SIZE: Final = 131072
+else:
+    DEFAULT_BUFFER_SIZE: Final = 8192
 
 open = builtins.open
 
@@ -19,32 +22,62 @@ def open_code(path: str) -> IO[bytes]: ...
 
 BlockingIOError = builtins.BlockingIOError
 
-class _IOBase:
-    def __iter__(self) -> Iterator[bytes]: ...
-    def __next__(self) -> bytes: ...
-    def __enter__(self) -> Self: ...
-    def __exit__(
-        self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
-    ) -> None: ...
-    def close(self) -> None: ...
-    def fileno(self) -> int: ...
-    def flush(self) -> None: ...
-    def isatty(self) -> bool: ...
-    def readable(self) -> bool: ...
-    read: Callable[..., Any]
-    def readlines(self, hint: int = -1, /) -> list[bytes]: ...
-    def seek(self, offset: int, whence: int = 0, /) -> int: ...
-    def seekable(self) -> bool: ...
-    def tell(self) -> int: ...
-    def truncate(self, size: int | None = None, /) -> int: ...
-    def writable(self) -> bool: ...
-    write: Callable[..., Any]
-    def writelines(self, lines: Iterable[ReadableBuffer], /) -> None: ...
-    def readline(self, size: int | None = -1, /) -> bytes: ...
-    def __del__(self) -> None: ...
-    @property
-    def closed(self) -> bool: ...
-    def _checkClosed(self) -> None: ...  # undocumented
+if sys.version_info >= (3, 12):
+    @disjoint_base
+    class _IOBase:
+        def __iter__(self) -> Iterator[bytes]: ...
+        def __next__(self) -> bytes: ...
+        def __enter__(self) -> Self: ...
+        def __exit__(
+            self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+        ) -> None: ...
+        def close(self) -> None: ...
+        def fileno(self) -> int: ...
+        def flush(self) -> None: ...
+        def isatty(self) -> bool: ...
+        def readable(self) -> bool: ...
+        read: Callable[..., Any]
+        def readlines(self, hint: int = -1, /) -> list[bytes]: ...
+        def seek(self, offset: int, whence: int = 0, /) -> int: ...
+        def seekable(self) -> bool: ...
+        def tell(self) -> int: ...
+        def truncate(self, size: int | None = None, /) -> int: ...
+        def writable(self) -> bool: ...
+        write: Callable[..., Any]
+        def writelines(self, lines: Iterable[ReadableBuffer], /) -> None: ...
+        def readline(self, size: int | None = -1, /) -> bytes: ...
+        def __del__(self) -> None: ...
+        @property
+        def closed(self) -> bool: ...
+        def _checkClosed(self) -> None: ...  # undocumented
+
+else:
+    class _IOBase:
+        def __iter__(self) -> Iterator[bytes]: ...
+        def __next__(self) -> bytes: ...
+        def __enter__(self) -> Self: ...
+        def __exit__(
+            self, exc_type: type[BaseException] | None, exc_val: BaseException | None, exc_tb: TracebackType | None
+        ) -> None: ...
+        def close(self) -> None: ...
+        def fileno(self) -> int: ...
+        def flush(self) -> None: ...
+        def isatty(self) -> bool: ...
+        def readable(self) -> bool: ...
+        read: Callable[..., Any]
+        def readlines(self, hint: int = -1, /) -> list[bytes]: ...
+        def seek(self, offset: int, whence: int = 0, /) -> int: ...
+        def seekable(self) -> bool: ...
+        def tell(self) -> int: ...
+        def truncate(self, size: int | None = None, /) -> int: ...
+        def writable(self) -> bool: ...
+        write: Callable[..., Any]
+        def writelines(self, lines: Iterable[ReadableBuffer], /) -> None: ...
+        def readline(self, size: int | None = -1, /) -> bytes: ...
+        def __del__(self) -> None: ...
+        @property
+        def closed(self) -> bool: ...
+        def _checkClosed(self) -> None: ...  # undocumented
 
 class _RawIOBase(_IOBase):
     def readall(self) -> bytes: ...
@@ -62,6 +95,7 @@ class _BufferedIOBase(_IOBase):
     def read(self, size: int | None = -1, /) -> bytes: ...
     def read1(self, size: int = -1, /) -> bytes: ...
 
+@disjoint_base
 class FileIO(RawIOBase, _RawIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of writelines in the base classes
     mode: str
     # The type of "name" equals the argument passed in to the constructor,
@@ -76,6 +110,7 @@ class FileIO(RawIOBase, _RawIOBase, BinaryIO):  # type: ignore[misc]  # incompat
     def seek(self, pos: int, whence: int = 0, /) -> int: ...
     def read(self, size: int | None = -1, /) -> bytes | MaybeNone: ...
 
+@disjoint_base
 class BytesIO(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
     def __init__(self, initial_bytes: ReadableBuffer = b"") -> None: ...
     # BytesIO does not contain a "name" field. This workaround is necessary
@@ -116,31 +151,51 @@ class _BufferedReaderStream(Protocol):
 
 _BufferedReaderStreamT = TypeVar("_BufferedReaderStreamT", bound=_BufferedReaderStream, default=_BufferedReaderStream)
 
+@disjoint_base
 class BufferedReader(BufferedIOBase, _BufferedIOBase, BinaryIO, Generic[_BufferedReaderStreamT]):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
     raw: _BufferedReaderStreamT
-    def __init__(self, raw: _BufferedReaderStreamT, buffer_size: int = 8192) -> None: ...
+    if sys.version_info >= (3, 14):
+        def __init__(self, raw: _BufferedReaderStreamT, buffer_size: int = 131072) -> None: ...
+    else:
+        def __init__(self, raw: _BufferedReaderStreamT, buffer_size: int = 8192) -> None: ...
+
     def peek(self, size: int = 0, /) -> bytes: ...
     def seek(self, target: int, whence: int = 0, /) -> int: ...
     def truncate(self, pos: int | None = None, /) -> int: ...
 
+@disjoint_base
 class BufferedWriter(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of writelines in the base classes
     raw: RawIOBase
-    def __init__(self, raw: RawIOBase, buffer_size: int = 8192) -> None: ...
+    if sys.version_info >= (3, 14):
+        def __init__(self, raw: RawIOBase, buffer_size: int = 131072) -> None: ...
+    else:
+        def __init__(self, raw: RawIOBase, buffer_size: int = 8192) -> None: ...
+
     def write(self, buffer: ReadableBuffer, /) -> int: ...
     def seek(self, target: int, whence: int = 0, /) -> int: ...
     def truncate(self, pos: int | None = None, /) -> int: ...
 
+@disjoint_base
 class BufferedRandom(BufferedIOBase, _BufferedIOBase, BinaryIO):  # type: ignore[misc]  # incompatible definitions of methods in the base classes
     mode: str
     name: Any
     raw: RawIOBase
-    def __init__(self, raw: RawIOBase, buffer_size: int = 8192) -> None: ...
+    if sys.version_info >= (3, 14):
+        def __init__(self, raw: RawIOBase, buffer_size: int = 131072) -> None: ...
+    else:
+        def __init__(self, raw: RawIOBase, buffer_size: int = 8192) -> None: ...
+
     def seek(self, target: int, whence: int = 0, /) -> int: ...  # stubtest needs this
     def peek(self, size: int = 0, /) -> bytes: ...
     def truncate(self, pos: int | None = None, /) -> int: ...
 
+@disjoint_base
 class BufferedRWPair(BufferedIOBase, _BufferedIOBase, Generic[_BufferedReaderStreamT]):
-    def __init__(self, reader: _BufferedReaderStreamT, writer: RawIOBase, buffer_size: int = 8192, /) -> None: ...
+    if sys.version_info >= (3, 14):
+        def __init__(self, reader: _BufferedReaderStreamT, writer: RawIOBase, buffer_size: int = 131072, /) -> None: ...
+    else:
+        def __init__(self, reader: _BufferedReaderStreamT, writer: RawIOBase, buffer_size: int = 8192, /) -> None: ...
+
     def peek(self, size: int = 0, /) -> bytes: ...
 
 class _TextIOBase(_IOBase):
@@ -181,6 +236,7 @@ class _WrappedBuffer(Protocol):
 
 _BufferT_co = TypeVar("_BufferT_co", bound=_WrappedBuffer, default=_WrappedBuffer, covariant=True)
 
+@disjoint_base
 class TextIOWrapper(TextIOBase, _TextIOBase, TextIO, Generic[_BufferT_co]):  # type: ignore[misc]  # incompatible definitions of write in the base classes
     def __init__(
         self,
@@ -215,6 +271,7 @@ class TextIOWrapper(TextIOBase, _TextIOBase, TextIO, Generic[_BufferT_co]):  # t
     def seek(self, cookie: int, whence: int = 0, /) -> int: ...
     def truncate(self, pos: int | None = None, /) -> int: ...
 
+@disjoint_base
 class StringIO(TextIOBase, _TextIOBase, TextIO):  # type: ignore[misc]  # incompatible definitions of write in the base classes
     def __init__(self, initial_value: str | None = "", newline: str | None = "\n") -> None: ...
     # StringIO does not contain a "name" field. This workaround is necessary
@@ -227,6 +284,7 @@ class StringIO(TextIOBase, _TextIOBase, TextIO):  # type: ignore[misc]  # incomp
     def seek(self, pos: int, whence: int = 0, /) -> int: ...
     def truncate(self, pos: int | None = None, /) -> int: ...
 
+@disjoint_base
 class IncrementalNewlineDecoder:
     def __init__(self, decoder: codecs.IncrementalDecoder | None, translate: bool, errors: str = "strict") -> None: ...
     def decode(self, input: ReadableBuffer | str, final: bool = False) -> str: ...
diff --git a/mypy/typeshed/stdlib/_lsprof.pyi b/mypy/typeshed/stdlib/_lsprof.pyi
index 8a6934162c92..4f6d98b8ffb6 100644
--- a/mypy/typeshed/stdlib/_lsprof.pyi
+++ b/mypy/typeshed/stdlib/_lsprof.pyi
@@ -3,7 +3,9 @@ from _typeshed import structseq
 from collections.abc import Callable
 from types import CodeType
 from typing import Any, Final, final
+from typing_extensions import disjoint_base
 
+@disjoint_base
 class Profiler:
     def __init__(
         self, timer: Callable[[], float] | None = None, timeunit: float = 0.0, subcalls: bool = True, builtins: bool = True
diff --git a/mypy/typeshed/stdlib/_lzma.pyi b/mypy/typeshed/stdlib/_lzma.pyi
index 1a27c7428e8e..b38dce9faded 100644
--- a/mypy/typeshed/stdlib/_lzma.pyi
+++ b/mypy/typeshed/stdlib/_lzma.pyi
@@ -16,7 +16,7 @@ CHECK_CRC64: Final = 4
 CHECK_SHA256: Final = 10
 CHECK_ID_MAX: Final = 15
 CHECK_UNKNOWN: Final = 16
-FILTER_LZMA1: int  # v big number
+FILTER_LZMA1: Final[int]  # v big number
 FILTER_LZMA2: Final = 33
 FILTER_DELTA: Final = 3
 FILTER_X86: Final = 4
@@ -33,14 +33,14 @@ MF_BT4: Final = 20
 MODE_FAST: Final = 1
 MODE_NORMAL: Final = 2
 PRESET_DEFAULT: Final = 6
-PRESET_EXTREME: int  # v big number
+PRESET_EXTREME: Final[int]  # v big number
 
 @final
 class LZMADecompressor:
     if sys.version_info >= (3, 12):
-        def __new__(cls, format: int | None = ..., memlimit: int | None = ..., filters: _FilterChain | None = ...) -> Self: ...
+        def __new__(cls, format: int = 0, memlimit: int | None = None, filters: _FilterChain | None = None) -> Self: ...
     else:
-        def __init__(self, format: int | None = ..., memlimit: int | None = ..., filters: _FilterChain | None = ...) -> None: ...
+        def __init__(self, format: int = 0, memlimit: int | None = None, filters: _FilterChain | None = None) -> None: ...
 
     def decompress(self, data: ReadableBuffer, max_length: int = -1) -> bytes: ...
     @property
@@ -56,11 +56,11 @@ class LZMADecompressor:
 class LZMACompressor:
     if sys.version_info >= (3, 12):
         def __new__(
-            cls, format: int | None = ..., check: int = ..., preset: int | None = ..., filters: _FilterChain | None = ...
+            cls, format: int = 1, check: int = -1, preset: int | None = None, filters: _FilterChain | None = None
         ) -> Self: ...
     else:
         def __init__(
-            self, format: int | None = ..., check: int = ..., preset: int | None = ..., filters: _FilterChain | None = ...
+            self, format: int = 1, check: int = -1, preset: int | None = None, filters: _FilterChain | None = None
         ) -> None: ...
 
     def compress(self, data: ReadableBuffer, /) -> bytes: ...
diff --git a/mypy/typeshed/stdlib/_msi.pyi b/mypy/typeshed/stdlib/_msi.pyi
index ef45ff6dc3c8..edceed51bf9d 100644
--- a/mypy/typeshed/stdlib/_msi.pyi
+++ b/mypy/typeshed/stdlib/_msi.pyi
@@ -1,5 +1,5 @@
 import sys
-from typing import type_check_only
+from typing import Final, type_check_only
 
 if sys.platform == "win32":
     class MSIError(Exception): ...
@@ -56,42 +56,42 @@ if sys.platform == "win32":
     def OpenDatabase(path: str, persist: int, /) -> _Database: ...
     def CreateRecord(count: int, /) -> _Record: ...
 
-    MSICOLINFO_NAMES: int
-    MSICOLINFO_TYPES: int
-    MSIDBOPEN_CREATE: int
-    MSIDBOPEN_CREATEDIRECT: int
-    MSIDBOPEN_DIRECT: int
-    MSIDBOPEN_PATCHFILE: int
-    MSIDBOPEN_READONLY: int
-    MSIDBOPEN_TRANSACT: int
-    MSIMODIFY_ASSIGN: int
-    MSIMODIFY_DELETE: int
-    MSIMODIFY_INSERT: int
-    MSIMODIFY_INSERT_TEMPORARY: int
-    MSIMODIFY_MERGE: int
-    MSIMODIFY_REFRESH: int
-    MSIMODIFY_REPLACE: int
-    MSIMODIFY_SEEK: int
-    MSIMODIFY_UPDATE: int
-    MSIMODIFY_VALIDATE: int
-    MSIMODIFY_VALIDATE_DELETE: int
-    MSIMODIFY_VALIDATE_FIELD: int
-    MSIMODIFY_VALIDATE_NEW: int
+    MSICOLINFO_NAMES: Final[int]
+    MSICOLINFO_TYPES: Final[int]
+    MSIDBOPEN_CREATE: Final[int]
+    MSIDBOPEN_CREATEDIRECT: Final[int]
+    MSIDBOPEN_DIRECT: Final[int]
+    MSIDBOPEN_PATCHFILE: Final[int]
+    MSIDBOPEN_READONLY: Final[int]
+    MSIDBOPEN_TRANSACT: Final[int]
+    MSIMODIFY_ASSIGN: Final[int]
+    MSIMODIFY_DELETE: Final[int]
+    MSIMODIFY_INSERT: Final[int]
+    MSIMODIFY_INSERT_TEMPORARY: Final[int]
+    MSIMODIFY_MERGE: Final[int]
+    MSIMODIFY_REFRESH: Final[int]
+    MSIMODIFY_REPLACE: Final[int]
+    MSIMODIFY_SEEK: Final[int]
+    MSIMODIFY_UPDATE: Final[int]
+    MSIMODIFY_VALIDATE: Final[int]
+    MSIMODIFY_VALIDATE_DELETE: Final[int]
+    MSIMODIFY_VALIDATE_FIELD: Final[int]
+    MSIMODIFY_VALIDATE_NEW: Final[int]
 
-    PID_APPNAME: int
-    PID_AUTHOR: int
-    PID_CHARCOUNT: int
-    PID_CODEPAGE: int
-    PID_COMMENTS: int
-    PID_CREATE_DTM: int
-    PID_KEYWORDS: int
-    PID_LASTAUTHOR: int
-    PID_LASTPRINTED: int
-    PID_LASTSAVE_DTM: int
-    PID_PAGECOUNT: int
-    PID_REVNUMBER: int
-    PID_SECURITY: int
-    PID_SUBJECT: int
-    PID_TEMPLATE: int
-    PID_TITLE: int
-    PID_WORDCOUNT: int
+    PID_APPNAME: Final[int]
+    PID_AUTHOR: Final[int]
+    PID_CHARCOUNT: Final[int]
+    PID_CODEPAGE: Final[int]
+    PID_COMMENTS: Final[int]
+    PID_CREATE_DTM: Final[int]
+    PID_KEYWORDS: Final[int]
+    PID_LASTAUTHOR: Final[int]
+    PID_LASTPRINTED: Final[int]
+    PID_LASTSAVE_DTM: Final[int]
+    PID_PAGECOUNT: Final[int]
+    PID_REVNUMBER: Final[int]
+    PID_SECURITY: Final[int]
+    PID_SUBJECT: Final[int]
+    PID_TEMPLATE: Final[int]
+    PID_TITLE: Final[int]
+    PID_WORDCOUNT: Final[int]
diff --git a/mypy/typeshed/stdlib/_multibytecodec.pyi b/mypy/typeshed/stdlib/_multibytecodec.pyi
index 7e408f2aa30e..abe58cb64f31 100644
--- a/mypy/typeshed/stdlib/_multibytecodec.pyi
+++ b/mypy/typeshed/stdlib/_multibytecodec.pyi
@@ -2,6 +2,7 @@ from _typeshed import ReadableBuffer
 from codecs import _ReadableStream, _WritableStream
 from collections.abc import Iterable
 from typing import final, type_check_only
+from typing_extensions import disjoint_base
 
 # This class is not exposed. It calls itself _multibytecodec.MultibyteCodec.
 @final
@@ -10,6 +11,7 @@ class _MultibyteCodec:
     def decode(self, input: ReadableBuffer, errors: str | None = None) -> str: ...
     def encode(self, input: str, errors: str | None = None) -> bytes: ...
 
+@disjoint_base
 class MultibyteIncrementalDecoder:
     errors: str
     def __init__(self, errors: str = "strict") -> None: ...
@@ -18,6 +20,7 @@ class MultibyteIncrementalDecoder:
     def reset(self) -> None: ...
     def setstate(self, state: tuple[bytes, int], /) -> None: ...
 
+@disjoint_base
 class MultibyteIncrementalEncoder:
     errors: str
     def __init__(self, errors: str = "strict") -> None: ...
@@ -26,6 +29,7 @@ class MultibyteIncrementalEncoder:
     def reset(self) -> None: ...
     def setstate(self, state: int, /) -> None: ...
 
+@disjoint_base
 class MultibyteStreamReader:
     errors: str
     stream: _ReadableStream
@@ -35,6 +39,7 @@ class MultibyteStreamReader:
     def readlines(self, sizehintobj: int | None = None, /) -> list[str]: ...
     def reset(self) -> None: ...
 
+@disjoint_base
 class MultibyteStreamWriter:
     errors: str
     stream: _WritableStream
diff --git a/mypy/typeshed/stdlib/_pickle.pyi b/mypy/typeshed/stdlib/_pickle.pyi
index 03051bb09d3c..544f787172d6 100644
--- a/mypy/typeshed/stdlib/_pickle.pyi
+++ b/mypy/typeshed/stdlib/_pickle.pyi
@@ -2,7 +2,7 @@ from _typeshed import ReadableBuffer, SupportsWrite
 from collections.abc import Callable, Iterable, Iterator, Mapping
 from pickle import PickleBuffer as PickleBuffer
 from typing import Any, Protocol, type_check_only
-from typing_extensions import TypeAlias
+from typing_extensions import TypeAlias, disjoint_base
 
 @type_check_only
 class _ReadableFileobj(Protocol):
@@ -57,6 +57,7 @@ class PicklerMemoProxy:
     def clear(self, /) -> None: ...
     def copy(self, /) -> dict[int, tuple[int, Any]]: ...
 
+@disjoint_base
 class Pickler:
     fast: bool
     dispatch_table: Mapping[type, Callable[[Any], _ReducedType]]
@@ -84,6 +85,7 @@ class UnpicklerMemoProxy:
     def clear(self, /) -> None: ...
     def copy(self, /) -> dict[int, tuple[int, Any]]: ...
 
+@disjoint_base
 class Unpickler:
     def __init__(
         self,
diff --git a/mypy/typeshed/stdlib/_queue.pyi b/mypy/typeshed/stdlib/_queue.pyi
index f98397b132ab..edd484a9a71a 100644
--- a/mypy/typeshed/stdlib/_queue.pyi
+++ b/mypy/typeshed/stdlib/_queue.pyi
@@ -1,10 +1,12 @@
 from types import GenericAlias
 from typing import Any, Generic, TypeVar
+from typing_extensions import disjoint_base
 
 _T = TypeVar("_T")
 
 class Empty(Exception): ...
 
+@disjoint_base
 class SimpleQueue(Generic[_T]):
     def __init__(self) -> None: ...
     def empty(self) -> bool: ...
diff --git a/mypy/typeshed/stdlib/_random.pyi b/mypy/typeshed/stdlib/_random.pyi
index 4082344ade8e..ac00fdfb7272 100644
--- a/mypy/typeshed/stdlib/_random.pyi
+++ b/mypy/typeshed/stdlib/_random.pyi
@@ -1,10 +1,16 @@
-from typing_extensions import TypeAlias
+import sys
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 # Actually Tuple[(int,) * 625]
 _State: TypeAlias = tuple[int, ...]
 
+@disjoint_base
 class Random:
-    def __init__(self, seed: object = ...) -> None: ...
+    if sys.version_info >= (3, 10):
+        def __init__(self, seed: object = ..., /) -> None: ...
+    else:
+        def __new__(self, seed: object = ..., /) -> Self: ...
+
     def seed(self, n: object = None, /) -> None: ...
     def getstate(self) -> _State: ...
     def setstate(self, state: _State, /) -> None: ...
diff --git a/mypy/typeshed/stdlib/_socket.pyi b/mypy/typeshed/stdlib/_socket.pyi
index 9c153a3a6ba0..cdad886b3415 100644
--- a/mypy/typeshed/stdlib/_socket.pyi
+++ b/mypy/typeshed/stdlib/_socket.pyi
@@ -3,7 +3,7 @@ from _typeshed import ReadableBuffer, WriteableBuffer
 from collections.abc import Iterable
 from socket import error as error, gaierror as gaierror, herror as herror, timeout as timeout
 from typing import Any, Final, SupportsIndex, overload
-from typing_extensions import CapsuleType, TypeAlias
+from typing_extensions import CapsuleType, TypeAlias, disjoint_base
 
 _CMSG: TypeAlias = tuple[int, int, bytes]
 _CMSGArg: TypeAlias = tuple[int, int, ReadableBuffer]
@@ -731,6 +731,7 @@ if sys.platform != "win32" and sys.platform != "darwin":
 
 # ===== Classes =====
 
+@disjoint_base
 class socket:
     @property
     def family(self) -> int: ...
diff --git a/mypy/typeshed/stdlib/_ssl.pyi b/mypy/typeshed/stdlib/_ssl.pyi
index 8afa3e5297bd..73a43f29c8c5 100644
--- a/mypy/typeshed/stdlib/_ssl.pyi
+++ b/mypy/typeshed/stdlib/_ssl.pyi
@@ -13,7 +13,7 @@ from ssl import (
     SSLZeroReturnError as SSLZeroReturnError,
 )
 from typing import Any, ClassVar, Final, Literal, TypedDict, final, overload, type_check_only
-from typing_extensions import NotRequired, Self, TypeAlias, deprecated
+from typing_extensions import NotRequired, Self, TypeAlias, deprecated, disjoint_base
 
 _PasswordType: TypeAlias = Callable[[], str | bytes | bytearray] | str | bytes | bytearray
 _PCTRTT: TypeAlias = tuple[tuple[str, str], ...]
@@ -67,7 +67,7 @@ if sys.platform == "win32":
 
 def txt2obj(txt: str, name: bool = False) -> tuple[int, str, str, str]: ...
 def nid2obj(nid: int, /) -> tuple[int, str, str, str]: ...
-
+@disjoint_base
 class _SSLContext:
     check_hostname: bool
     keylog_filename: str | None
diff --git a/mypy/typeshed/stdlib/_struct.pyi b/mypy/typeshed/stdlib/_struct.pyi
index 662170e869f3..a8fac2aea1b0 100644
--- a/mypy/typeshed/stdlib/_struct.pyi
+++ b/mypy/typeshed/stdlib/_struct.pyi
@@ -1,6 +1,7 @@
 from _typeshed import ReadableBuffer, WriteableBuffer
 from collections.abc import Iterator
 from typing import Any
+from typing_extensions import disjoint_base
 
 def pack(fmt: str | bytes, /, *v: Any) -> bytes: ...
 def pack_into(fmt: str | bytes, buffer: WriteableBuffer, offset: int, /, *v: Any) -> None: ...
@@ -8,7 +9,7 @@ def unpack(format: str | bytes, buffer: ReadableBuffer, /) -> tuple[Any, ...]: .
 def unpack_from(format: str | bytes, /, buffer: ReadableBuffer, offset: int = 0) -> tuple[Any, ...]: ...
 def iter_unpack(format: str | bytes, buffer: ReadableBuffer, /) -> Iterator[tuple[Any, ...]]: ...
 def calcsize(format: str | bytes, /) -> int: ...
-
+@disjoint_base
 class Struct:
     @property
     def format(self) -> str: ...
diff --git a/mypy/typeshed/stdlib/_thread.pyi b/mypy/typeshed/stdlib/_thread.pyi
index 970130dfb09c..6969ae48cae7 100644
--- a/mypy/typeshed/stdlib/_thread.pyi
+++ b/mypy/typeshed/stdlib/_thread.pyi
@@ -5,7 +5,7 @@ from collections.abc import Callable
 from threading import Thread
 from types import TracebackType
 from typing import Any, Final, NoReturn, final, overload
-from typing_extensions import TypeVarTuple, Unpack
+from typing_extensions import TypeVarTuple, Unpack, disjoint_base
 
 _Ts = TypeVarTuple("_Ts")
 
@@ -85,7 +85,7 @@ def allocate() -> LockType: ...  # Obsolete synonym for allocate_lock()
 def get_ident() -> int: ...
 def stack_size(size: int = 0, /) -> int: ...
 
-TIMEOUT_MAX: float
+TIMEOUT_MAX: Final[float]
 
 def get_native_id() -> int: ...  # only available on some platforms
 @final
@@ -110,6 +110,7 @@ if sys.version_info >= (3, 12):
 if sys.version_info >= (3, 14):
     def set_name(name: str) -> None: ...
 
+@disjoint_base
 class _local:
     def __getattribute__(self, name: str, /) -> Any: ...
     def __setattr__(self, name: str, value: Any, /) -> None: ...
diff --git a/mypy/typeshed/stdlib/_threading_local.pyi b/mypy/typeshed/stdlib/_threading_local.pyi
index 07a825f0d816..5f6acaf840aa 100644
--- a/mypy/typeshed/stdlib/_threading_local.pyi
+++ b/mypy/typeshed/stdlib/_threading_local.pyi
@@ -7,6 +7,7 @@ __all__ = ["local"]
 _LocalDict: TypeAlias = dict[Any, Any]
 
 class _localimpl:
+    __slots__ = ("key", "dicts", "localargs", "locallock", "__weakref__")
     key: str
     dicts: dict[int, tuple[ReferenceType[Any], _LocalDict]]
     # Keep localargs in sync with the *args, **kwargs annotation on local.__new__
@@ -16,6 +17,7 @@ class _localimpl:
     def create_dict(self) -> _LocalDict: ...
 
 class local:
+    __slots__ = ("_local__impl", "__dict__")
     def __new__(cls, /, *args: Any, **kw: Any) -> Self: ...
     def __getattribute__(self, name: str) -> Any: ...
     def __setattr__(self, name: str, value: Any) -> None: ...
diff --git a/mypy/typeshed/stdlib/_typeshed/__init__.pyi b/mypy/typeshed/stdlib/_typeshed/__init__.pyi
index 98a369dfc589..25054b601a4f 100644
--- a/mypy/typeshed/stdlib/_typeshed/__init__.pyi
+++ b/mypy/typeshed/stdlib/_typeshed/__init__.pyi
@@ -3,7 +3,7 @@
 # See the README.md file in this directory for more information.
 
 import sys
-from collections.abc import Awaitable, Callable, Iterable, Sequence, Set as AbstractSet, Sized
+from collections.abc import Awaitable, Callable, Iterable, Iterator, Sequence, Set as AbstractSet, Sized
 from dataclasses import Field
 from os import PathLike
 from types import FrameType, TracebackType
@@ -54,7 +54,8 @@ Unused: TypeAlias = object  # stable
 
 # Marker for return types that include None, but where forcing the user to
 # check for None can be detrimental. Sometimes called "the Any trick". See
-# CONTRIBUTING.md for more information.
+# https://typing.python.org/en/latest/guides/writing_stubs.html#the-any-trick
+# for more information.
 MaybeNone: TypeAlias = Any  # stable
 
 # Used to mark arguments that default to a sentinel value. This prevents
@@ -275,6 +276,16 @@ class SupportsWrite(Protocol[_T_contra]):
 class SupportsFlush(Protocol):
     def flush(self) -> object: ...
 
+# Suitable for dictionary view objects
+class Viewable(Protocol[_T_co]):
+    def __len__(self) -> int: ...
+    def __iter__(self) -> Iterator[_T_co]: ...
+
+class SupportsGetItemViewable(Protocol[_KT, _VT_co]):
+    def __len__(self) -> int: ...
+    def __iter__(self) -> Iterator[_KT]: ...
+    def __getitem__(self, key: _KT, /) -> _VT_co: ...
+
 # Unfortunately PEP 688 does not allow us to distinguish read-only
 # from writable buffers. We use these aliases for readability for now.
 # Perhaps a future extension of the buffer protocol will allow us to
diff --git a/mypy/typeshed/stdlib/_warnings.pyi b/mypy/typeshed/stdlib/_warnings.pyi
index 2e571e676c97..2dbc7b855281 100644
--- a/mypy/typeshed/stdlib/_warnings.pyi
+++ b/mypy/typeshed/stdlib/_warnings.pyi
@@ -38,9 +38,9 @@ def warn_explicit(
     filename: str,
     lineno: int,
     module: str | None = ...,
-    registry: dict[str | tuple[str, type[Warning], int], int] | None = ...,
-    module_globals: dict[str, Any] | None = ...,
-    source: Any | None = ...,
+    registry: dict[str | tuple[str, type[Warning], int], int] | None = None,
+    module_globals: dict[str, Any] | None = None,
+    source: Any | None = None,
 ) -> None: ...
 @overload
 def warn_explicit(
@@ -48,8 +48,8 @@ def warn_explicit(
     category: Any,
     filename: str,
     lineno: int,
-    module: str | None = ...,
-    registry: dict[str | tuple[str, type[Warning], int], int] | None = ...,
-    module_globals: dict[str, Any] | None = ...,
-    source: Any | None = ...,
+    module: str | None = None,
+    registry: dict[str | tuple[str, type[Warning], int], int] | None = None,
+    module_globals: dict[str, Any] | None = None,
+    source: Any | None = None,
 ) -> None: ...
diff --git a/mypy/typeshed/stdlib/_winapi.pyi b/mypy/typeshed/stdlib/_winapi.pyi
index 6083ea4ae57a..d9e2c377b115 100644
--- a/mypy/typeshed/stdlib/_winapi.pyi
+++ b/mypy/typeshed/stdlib/_winapi.pyi
@@ -128,21 +128,21 @@ if sys.platform == "win32":
     WAIT_TIMEOUT: Final = 258
 
     if sys.version_info >= (3, 10):
-        LOCALE_NAME_INVARIANT: str
-        LOCALE_NAME_MAX_LENGTH: int
-        LOCALE_NAME_SYSTEM_DEFAULT: str
-        LOCALE_NAME_USER_DEFAULT: str | None
+        LOCALE_NAME_INVARIANT: Final[str]
+        LOCALE_NAME_MAX_LENGTH: Final[int]
+        LOCALE_NAME_SYSTEM_DEFAULT: Final[str]
+        LOCALE_NAME_USER_DEFAULT: Final[str | None]
 
-        LCMAP_FULLWIDTH: int
-        LCMAP_HALFWIDTH: int
-        LCMAP_HIRAGANA: int
-        LCMAP_KATAKANA: int
-        LCMAP_LINGUISTIC_CASING: int
-        LCMAP_LOWERCASE: int
-        LCMAP_SIMPLIFIED_CHINESE: int
-        LCMAP_TITLECASE: int
-        LCMAP_TRADITIONAL_CHINESE: int
-        LCMAP_UPPERCASE: int
+        LCMAP_FULLWIDTH: Final[int]
+        LCMAP_HALFWIDTH: Final[int]
+        LCMAP_HIRAGANA: Final[int]
+        LCMAP_KATAKANA: Final[int]
+        LCMAP_LINGUISTIC_CASING: Final[int]
+        LCMAP_LOWERCASE: Final[int]
+        LCMAP_SIMPLIFIED_CHINESE: Final[int]
+        LCMAP_TITLECASE: Final[int]
+        LCMAP_TRADITIONAL_CHINESE: Final[int]
+        LCMAP_UPPERCASE: Final[int]
 
     if sys.version_info >= (3, 12):
         COPYFILE2_CALLBACK_CHUNK_STARTED: Final = 1
diff --git a/mypy/typeshed/stdlib/_zstd.pyi b/mypy/typeshed/stdlib/_zstd.pyi
index 2730232528fc..f5e98ef88bb9 100644
--- a/mypy/typeshed/stdlib/_zstd.pyi
+++ b/mypy/typeshed/stdlib/_zstd.pyi
@@ -45,9 +45,9 @@ class ZstdCompressor:
     CONTINUE: Final = 0
     FLUSH_BLOCK: Final = 1
     FLUSH_FRAME: Final = 2
-    def __init__(
-        self, level: int | None = None, options: Mapping[int, int] | None = None, zstd_dict: ZstdDict | None = None
-    ) -> None: ...
+    def __new__(
+        cls, level: int | None = None, options: Mapping[int, int] | None = None, zstd_dict: ZstdDict | None = None
+    ) -> Self: ...
     def compress(
         self, /, data: ReadableBuffer, mode: _ZstdCompressorContinue | _ZstdCompressorFlushBlock | _ZstdCompressorFlushFrame = 0
     ) -> bytes: ...
@@ -58,7 +58,7 @@ class ZstdCompressor:
 
 @final
 class ZstdDecompressor:
-    def __init__(self, zstd_dict: ZstdDict | None = None, options: Mapping[int, int] | None = None) -> None: ...
+    def __new__(cls, zstd_dict: ZstdDict | None = None, options: Mapping[int, int] | None = None) -> Self: ...
     def decompress(self, /, data: ReadableBuffer, max_length: int = -1) -> bytes: ...
     @property
     def eof(self) -> bool: ...
@@ -69,7 +69,7 @@ class ZstdDecompressor:
 
 @final
 class ZstdDict:
-    def __init__(self, dict_content: bytes, /, *, is_raw: bool = False) -> None: ...
+    def __new__(cls, dict_content: bytes, /, *, is_raw: bool = False) -> Self: ...
     def __len__(self, /) -> int: ...
     @property
     def as_digested_dict(self) -> tuple[Self, int]: ...
diff --git a/mypy/typeshed/stdlib/abc.pyi b/mypy/typeshed/stdlib/abc.pyi
index fdca48ac7aaf..c8cd549e30ec 100644
--- a/mypy/typeshed/stdlib/abc.pyi
+++ b/mypy/typeshed/stdlib/abc.pyi
@@ -28,17 +28,17 @@ class ABCMeta(type):
     def register(cls: ABCMeta, subclass: type[_T]) -> type[_T]: ...
 
 def abstractmethod(funcobj: _FuncT) -> _FuncT: ...
-@deprecated("Use 'classmethod' with 'abstractmethod' instead")
+@deprecated("Deprecated since Python 3.3. Use `@classmethod` stacked on top of `@abstractmethod` instead.")
 class abstractclassmethod(classmethod[_T, _P, _R_co]):
     __isabstractmethod__: Literal[True]
     def __init__(self, callable: Callable[Concatenate[type[_T], _P], _R_co]) -> None: ...
 
-@deprecated("Use 'staticmethod' with 'abstractmethod' instead")
+@deprecated("Deprecated since Python 3.3. Use `@staticmethod` stacked on top of `@abstractmethod` instead.")
 class abstractstaticmethod(staticmethod[_P, _R_co]):
     __isabstractmethod__: Literal[True]
     def __init__(self, callable: Callable[_P, _R_co]) -> None: ...
 
-@deprecated("Use 'property' with 'abstractmethod' instead")
+@deprecated("Deprecated since Python 3.3. Use `@property` stacked on top of `@abstractmethod` instead.")
 class abstractproperty(property):
     __isabstractmethod__: Literal[True]
 
diff --git a/mypy/typeshed/stdlib/annotationlib.pyi b/mypy/typeshed/stdlib/annotationlib.pyi
index 7590c632d785..3679dc29daaa 100644
--- a/mypy/typeshed/stdlib/annotationlib.pyi
+++ b/mypy/typeshed/stdlib/annotationlib.pyi
@@ -28,6 +28,20 @@ if sys.version_info >= (3, 14):
 
     @final
     class ForwardRef:
+        __slots__ = (
+            "__forward_is_argument__",
+            "__forward_is_class__",
+            "__forward_module__",
+            "__weakref__",
+            "__arg__",
+            "__globals__",
+            "__extra_names__",
+            "__code__",
+            "__ast_node__",
+            "__cell__",
+            "__owner__",
+            "__stringifier_dict__",
+        )
         __forward_is_argument__: bool
         __forward_is_class__: bool
         __forward_module__: str | None
@@ -64,7 +78,7 @@ if sys.version_info >= (3, 14):
             owner: object = None,
             format: Format = Format.VALUE,  # noqa: Y011
         ) -> AnnotationForm: ...
-        @deprecated("Use ForwardRef.evaluate() or typing.evaluate_forward_ref() instead.")
+        @deprecated("Use `ForwardRef.evaluate()` or `typing.evaluate_forward_ref()` instead.")
         def _evaluate(
             self,
             globalns: dict[str, Any] | None,
diff --git a/mypy/typeshed/stdlib/argparse.pyi b/mypy/typeshed/stdlib/argparse.pyi
index 3c3ba116a692..f4b3aac09aa9 100644
--- a/mypy/typeshed/stdlib/argparse.pyi
+++ b/mypy/typeshed/stdlib/argparse.pyi
@@ -156,7 +156,7 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
             exit_on_error: bool = True,
             *,
             suggest_on_error: bool = False,
-            color: bool = False,
+            color: bool = True,
         ) -> None: ...
     else:
         def __init__(
@@ -470,7 +470,7 @@ class Namespace(_AttributeHolder):
     __hash__: ClassVar[None]  # type: ignore[assignment]
 
 if sys.version_info >= (3, 14):
-    @deprecated("Deprecated in Python 3.14; Simply open files after parsing arguments")
+    @deprecated("Deprecated since Python 3.14. Open files after parsing arguments instead.")
     class FileType:
         # undocumented
         _mode: str
diff --git a/mypy/typeshed/stdlib/array.pyi b/mypy/typeshed/stdlib/array.pyi
index ccb7f1b98ef3..a6b0344a1e2e 100644
--- a/mypy/typeshed/stdlib/array.pyi
+++ b/mypy/typeshed/stdlib/array.pyi
@@ -3,7 +3,7 @@ from _typeshed import ReadableBuffer, SupportsRead, SupportsWrite
 from collections.abc import Iterable, MutableSequence
 from types import GenericAlias
 from typing import Any, ClassVar, Literal, SupportsIndex, TypeVar, overload
-from typing_extensions import Self, TypeAlias, deprecated
+from typing_extensions import Self, TypeAlias, deprecated, disjoint_base
 
 _IntTypeCode: TypeAlias = Literal["b", "B", "h", "H", "i", "I", "l", "L", "q", "Q"]
 _FloatTypeCode: TypeAlias = Literal["f", "d"]
@@ -17,6 +17,7 @@ _T = TypeVar("_T", int, float, str)
 
 typecodes: str
 
+@disjoint_base
 class array(MutableSequence[_T]):
     @property
     def typecode(self) -> _TypeCode: ...
diff --git a/mypy/typeshed/stdlib/ast.pyi b/mypy/typeshed/stdlib/ast.pyi
index 8ee867116301..d360c2ed60e5 100644
--- a/mypy/typeshed/stdlib/ast.pyi
+++ b/mypy/typeshed/stdlib/ast.pyi
@@ -11,7 +11,7 @@ from _ast import (
 from _typeshed import ReadableBuffer, Unused
 from collections.abc import Iterable, Iterator, Sequence
 from typing import Any, ClassVar, Generic, Literal, TypedDict, TypeVar as _TypeVar, overload, type_check_only
-from typing_extensions import Self, Unpack, deprecated
+from typing_extensions import Self, Unpack, deprecated, disjoint_base
 
 if sys.version_info >= (3, 13):
     from _ast import PyCF_OPTIMIZED_AST as PyCF_OPTIMIZED_AST
@@ -30,16 +30,24 @@ class _Attributes(TypedDict, Generic[_EndPositionT], total=False):
 # The various AST classes are implemented in C, and imported from _ast at runtime,
 # but they consider themselves to live in the ast module,
 # so we'll define the stubs in this file.
-class AST:
-    if sys.version_info >= (3, 10):
+if sys.version_info >= (3, 12):
+    @disjoint_base
+    class AST:
         __match_args__ = ()
-    _attributes: ClassVar[tuple[str, ...]]
-    _fields: ClassVar[tuple[str, ...]]
-    if sys.version_info >= (3, 13):
-        _field_types: ClassVar[dict[str, Any]]
+        _attributes: ClassVar[tuple[str, ...]]
+        _fields: ClassVar[tuple[str, ...]]
+        if sys.version_info >= (3, 13):
+            _field_types: ClassVar[dict[str, Any]]
 
-    if sys.version_info >= (3, 14):
-        def __replace__(self) -> Self: ...
+        if sys.version_info >= (3, 14):
+            def __replace__(self) -> Self: ...
+
+else:
+    class AST:
+        if sys.version_info >= (3, 10):
+            __match_args__ = ()
+        _attributes: ClassVar[tuple[str, ...]]
+        _fields: ClassVar[tuple[str, ...]]
 
 class mod(AST): ...
 
@@ -1098,16 +1106,16 @@ class Constant(expr):
     if sys.version_info < (3, 14):
         # Aliases for value, for backwards compatibility
         @property
-        @deprecated("Will be removed in Python 3.14. Use `value` instead.")
+        @deprecated("Removed in Python 3.14. Use `value` instead.")
         def n(self) -> _ConstantValue: ...
         @n.setter
-        @deprecated("Will be removed in Python 3.14. Use `value` instead.")
+        @deprecated("Removed in Python 3.14. Use `value` instead.")
         def n(self, value: _ConstantValue) -> None: ...
         @property
-        @deprecated("Will be removed in Python 3.14. Use `value` instead.")
+        @deprecated("Removed in Python 3.14. Use `value` instead.")
         def s(self) -> _ConstantValue: ...
         @s.setter
-        @deprecated("Will be removed in Python 3.14. Use `value` instead.")
+        @deprecated("Removed in Python 3.14. Use `value` instead.")
         def s(self, value: _ConstantValue) -> None: ...
 
     def __init__(self, value: _ConstantValue, kind: str | None = None, **kwargs: Unpack[_Attributes]) -> None: ...
@@ -1206,7 +1214,7 @@ class Slice(expr):
             self, *, lower: expr | None = ..., upper: expr | None = ..., step: expr | None = ..., **kwargs: Unpack[_Attributes]
         ) -> Self: ...
 
-@deprecated("Deprecated since Python 3.9. Use ast.Tuple instead.")
+@deprecated("Deprecated since Python 3.9. Use `ast.Tuple` instead.")
 class ExtSlice(slice):
     def __new__(cls, dims: Iterable[slice] = (), **kwargs: Unpack[_Attributes]) -> Tuple: ...  # type: ignore[misc]
 
@@ -1711,23 +1719,23 @@ else:
         def __init__(cls, *args: Unused) -> None: ...
 
 if sys.version_info < (3, 14):
-    @deprecated("Replaced by ast.Constant; removed in Python 3.14")
+    @deprecated("Removed in Python 3.14. Use `ast.Constant` instead.")
     class Num(Constant, metaclass=_ABC):
         def __new__(cls, n: complex, **kwargs: Unpack[_Attributes]) -> Constant: ...  # type: ignore[misc]  # pyright: ignore[reportInconsistentConstructor]
 
-    @deprecated("Replaced by ast.Constant; removed in Python 3.14")
+    @deprecated("Removed in Python 3.14. Use `ast.Constant` instead.")
     class Str(Constant, metaclass=_ABC):
         def __new__(cls, s: str, **kwargs: Unpack[_Attributes]) -> Constant: ...  # type: ignore[misc]  # pyright: ignore[reportInconsistentConstructor]
 
-    @deprecated("Replaced by ast.Constant; removed in Python 3.14")
+    @deprecated("Removed in Python 3.14. Use `ast.Constant` instead.")
     class Bytes(Constant, metaclass=_ABC):
         def __new__(cls, s: bytes, **kwargs: Unpack[_Attributes]) -> Constant: ...  # type: ignore[misc]  # pyright: ignore[reportInconsistentConstructor]
 
-    @deprecated("Replaced by ast.Constant; removed in Python 3.14")
+    @deprecated("Removed in Python 3.14. Use `ast.Constant` instead.")
     class NameConstant(Constant, metaclass=_ABC):
         def __new__(cls, value: _ConstantValue, kind: str | None, **kwargs: Unpack[_Attributes]) -> Constant: ...  # type: ignore[misc]  # pyright: ignore[reportInconsistentConstructor]
 
-    @deprecated("Replaced by ast.Constant; removed in Python 3.14")
+    @deprecated("Removed in Python 3.14. Use `ast.Constant` instead.")
     class Ellipsis(Constant, metaclass=_ABC):
         def __new__(cls, **kwargs: Unpack[_Attributes]) -> Constant: ...  # type: ignore[misc]  # pyright: ignore[reportInconsistentConstructor]
 
@@ -2046,15 +2054,15 @@ class NodeVisitor:
     def visit_Param(self, node: Param) -> Any: ...
 
     if sys.version_info < (3, 14):
-        @deprecated("Replaced by visit_Constant; removed in Python 3.14")
+        @deprecated("Removed in Python 3.14. Use `visit_Constant` instead.")
         def visit_Num(self, node: Num) -> Any: ...  # type: ignore[deprecated]
-        @deprecated("Replaced by visit_Constant; removed in Python 3.14")
+        @deprecated("Removed in Python 3.14. Use `visit_Constant` instead.")
         def visit_Str(self, node: Str) -> Any: ...  # type: ignore[deprecated]
-        @deprecated("Replaced by visit_Constant; removed in Python 3.14")
+        @deprecated("Removed in Python 3.14. Use `visit_Constant` instead.")
         def visit_Bytes(self, node: Bytes) -> Any: ...  # type: ignore[deprecated]
-        @deprecated("Replaced by visit_Constant; removed in Python 3.14")
+        @deprecated("Removed in Python 3.14. Use `visit_Constant` instead.")
         def visit_NameConstant(self, node: NameConstant) -> Any: ...  # type: ignore[deprecated]
-        @deprecated("Replaced by visit_Constant; removed in Python 3.14")
+        @deprecated("Removed in Python 3.14. Use `visit_Constant` instead.")
         def visit_Ellipsis(self, node: Ellipsis) -> Any: ...  # type: ignore[deprecated]
 
 class NodeTransformer(NodeVisitor):
diff --git a/mypy/typeshed/stdlib/asyncio/base_events.pyi b/mypy/typeshed/stdlib/asyncio/base_events.pyi
index cad7dde40b01..1f493210d665 100644
--- a/mypy/typeshed/stdlib/asyncio/base_events.pyi
+++ b/mypy/typeshed/stdlib/asyncio/base_events.pyi
@@ -10,7 +10,7 @@ from asyncio.transports import BaseTransport, DatagramTransport, ReadTransport,
 from collections.abc import Callable, Iterable, Sequence
 from concurrent.futures import Executor, ThreadPoolExecutor
 from contextvars import Context
-from socket import AddressFamily, SocketKind, _Address, _RetAddress, socket
+from socket import AddressFamily, AddressInfo, SocketKind, _Address, _RetAddress, socket
 from typing import IO, Any, Literal, TypeVar, overload
 from typing_extensions import TypeAlias, TypeVarTuple, Unpack
 
@@ -235,8 +235,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = 0,
+            flags: int = 1,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -254,8 +254,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = 0,
+            flags: int = 1,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -274,8 +274,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -292,8 +292,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -311,8 +311,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -328,8 +328,8 @@ class BaseEventLoop(AbstractEventLoop):
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
diff --git a/mypy/typeshed/stdlib/asyncio/events.pyi b/mypy/typeshed/stdlib/asyncio/events.pyi
index a37f6f697b9a..14c4c0bf3d5a 100644
--- a/mypy/typeshed/stdlib/asyncio/events.pyi
+++ b/mypy/typeshed/stdlib/asyncio/events.pyi
@@ -11,7 +11,7 @@ from abc import ABCMeta, abstractmethod
 from collections.abc import Callable, Sequence
 from concurrent.futures import Executor
 from contextvars import Context
-from socket import AddressFamily, SocketKind, _Address, _RetAddress, socket
+from socket import AddressFamily, AddressInfo, SocketKind, _Address, _RetAddress, socket
 from typing import IO, Any, Literal, Protocol, TypeVar, overload, type_check_only
 from typing_extensions import Self, TypeAlias, TypeVarTuple, Unpack, deprecated
 
@@ -73,6 +73,7 @@ class _TaskFactory(Protocol):
     def __call__(self, loop: AbstractEventLoop, factory: _CoroutineLike[_T], /) -> Future[_T]: ...
 
 class Handle:
+    __slots__ = ("_callback", "_args", "_cancelled", "_loop", "_source_traceback", "_repr", "__weakref__", "_context")
     _cancelled: bool
     _args: Sequence[Any]
     def __init__(
@@ -85,6 +86,7 @@ class Handle:
         def get_context(self) -> Context: ...
 
 class TimerHandle(Handle):
+    __slots__ = ["_scheduled", "_when"]
     def __init__(
         self,
         when: float,
@@ -287,8 +289,8 @@ class AbstractEventLoop:
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -307,8 +309,8 @@ class AbstractEventLoop:
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -328,8 +330,8 @@ class AbstractEventLoop:
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -347,8 +349,8 @@ class AbstractEventLoop:
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -367,8 +369,8 @@ class AbstractEventLoop:
             host: str | Sequence[str] | None = None,
             port: int = ...,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: None = None,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -385,8 +387,8 @@ class AbstractEventLoop:
             host: None = None,
             port: None = None,
             *,
-            family: int = ...,
-            flags: int = ...,
+            family: int = AddressFamily.AF_UNSPEC,
+            flags: int = AddressInfo.AI_PASSIVE,
             sock: socket = ...,
             backlog: int = 100,
             ssl: _SSLContext = None,
@@ -534,7 +536,7 @@ class AbstractEventLoop:
         bufsize: Literal[0] = 0,
         encoding: None = None,
         errors: None = None,
-        text: Literal[False] | None = ...,
+        text: Literal[False] | None = None,
         **kwargs: Any,
     ) -> tuple[SubprocessTransport, _ProtocolT]: ...
     @abstractmethod
@@ -614,10 +616,10 @@ class _AbstractEventLoopPolicy:
     if sys.version_info < (3, 14):
         if sys.version_info >= (3, 12):
             @abstractmethod
-            @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             def get_child_watcher(self) -> AbstractChildWatcher: ...
             @abstractmethod
-            @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             def set_child_watcher(self, watcher: AbstractChildWatcher) -> None: ...
         else:
             @abstractmethod
@@ -643,9 +645,9 @@ else:
 if sys.version_info >= (3, 14):
     def _get_event_loop_policy() -> _AbstractEventLoopPolicy: ...
     def _set_event_loop_policy(policy: _AbstractEventLoopPolicy | None) -> None: ...
-    @deprecated("Deprecated as of Python 3.14; will be removed in Python 3.16")
+    @deprecated("Deprecated since Python 3.14; will be removed in Python 3.16.")
     def get_event_loop_policy() -> _AbstractEventLoopPolicy: ...
-    @deprecated("Deprecated as of Python 3.14; will be removed in Python 3.16")
+    @deprecated("Deprecated since Python 3.14; will be removed in Python 3.16.")
     def set_event_loop_policy(policy: _AbstractEventLoopPolicy | None) -> None: ...
 
 else:
@@ -657,9 +659,9 @@ def new_event_loop() -> AbstractEventLoop: ...
 
 if sys.version_info < (3, 14):
     if sys.version_info >= (3, 12):
-        @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+        @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
         def get_child_watcher() -> AbstractChildWatcher: ...
-        @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+        @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
         def set_child_watcher(watcher: AbstractChildWatcher) -> None: ...
 
     else:
diff --git a/mypy/typeshed/stdlib/asyncio/graph.pyi b/mypy/typeshed/stdlib/asyncio/graph.pyi
index cb2cf0174995..18a8a6457d75 100644
--- a/mypy/typeshed/stdlib/asyncio/graph.pyi
+++ b/mypy/typeshed/stdlib/asyncio/graph.pyi
@@ -1,26 +1,28 @@
+import sys
 from _typeshed import SupportsWrite
 from asyncio import Future
 from dataclasses import dataclass
 from types import FrameType
 from typing import Any, overload
 
-__all__ = ("capture_call_graph", "format_call_graph", "print_call_graph", "FrameCallGraphEntry", "FutureCallGraph")
+if sys.version_info >= (3, 14):
+    __all__ = ("capture_call_graph", "format_call_graph", "print_call_graph", "FrameCallGraphEntry", "FutureCallGraph")
 
-@dataclass(frozen=True)
-class FrameCallGraphEntry:
-    frame: FrameType
+    @dataclass(frozen=True, slots=True)
+    class FrameCallGraphEntry:
+        frame: FrameType
 
-@dataclass(frozen=True)
-class FutureCallGraph:
-    future: Future[Any]
-    call_stack: tuple[FrameCallGraphEntry, ...]
-    awaited_by: tuple[FutureCallGraph, ...]
+    @dataclass(frozen=True, slots=True)
+    class FutureCallGraph:
+        future: Future[Any]
+        call_stack: tuple[FrameCallGraphEntry, ...]
+        awaited_by: tuple[FutureCallGraph, ...]
 
-@overload
-def capture_call_graph(future: None = None, /, *, depth: int = 1, limit: int | None = None) -> FutureCallGraph | None: ...
-@overload
-def capture_call_graph(future: Future[Any], /, *, depth: int = 1, limit: int | None = None) -> FutureCallGraph | None: ...
-def format_call_graph(future: Future[Any] | None = None, /, *, depth: int = 1, limit: int | None = None) -> str: ...
-def print_call_graph(
-    future: Future[Any] | None = None, /, *, file: SupportsWrite[str] | None = None, depth: int = 1, limit: int | None = None
-) -> None: ...
+    @overload
+    def capture_call_graph(future: None = None, /, *, depth: int = 1, limit: int | None = None) -> FutureCallGraph | None: ...
+    @overload
+    def capture_call_graph(future: Future[Any], /, *, depth: int = 1, limit: int | None = None) -> FutureCallGraph | None: ...
+    def format_call_graph(future: Future[Any] | None = None, /, *, depth: int = 1, limit: int | None = None) -> str: ...
+    def print_call_graph(
+        future: Future[Any] | None = None, /, *, file: SupportsWrite[str] | None = None, depth: int = 1, limit: int | None = None
+    ) -> None: ...
diff --git a/mypy/typeshed/stdlib/asyncio/protocols.pyi b/mypy/typeshed/stdlib/asyncio/protocols.pyi
index 5425336c49a8..2c52ad4be410 100644
--- a/mypy/typeshed/stdlib/asyncio/protocols.pyi
+++ b/mypy/typeshed/stdlib/asyncio/protocols.pyi
@@ -6,21 +6,26 @@ from typing import Any
 __all__ = ("BaseProtocol", "Protocol", "DatagramProtocol", "SubprocessProtocol", "BufferedProtocol")
 
 class BaseProtocol:
+    __slots__ = ()
     def connection_made(self, transport: transports.BaseTransport) -> None: ...
     def connection_lost(self, exc: Exception | None) -> None: ...
     def pause_writing(self) -> None: ...
     def resume_writing(self) -> None: ...
 
 class Protocol(BaseProtocol):
+    # Need annotation or mypy will complain about 'Cannot determine type of "__slots__" in base class'
+    __slots__: tuple[()] = ()
     def data_received(self, data: bytes) -> None: ...
     def eof_received(self) -> bool | None: ...
 
 class BufferedProtocol(BaseProtocol):
+    __slots__ = ()
     def get_buffer(self, sizehint: int) -> ReadableBuffer: ...
     def buffer_updated(self, nbytes: int) -> None: ...
     def eof_received(self) -> bool | None: ...
 
 class DatagramProtocol(BaseProtocol):
+    __slots__ = ()
     def connection_made(self, transport: transports.DatagramTransport) -> None: ...  # type: ignore[override]
     # addr can be a tuple[int, int] for some unusual protocols like socket.AF_NETLINK.
     # Use tuple[str | Any, int] to not cause typechecking issues on most usual cases.
@@ -30,6 +35,7 @@ class DatagramProtocol(BaseProtocol):
     def error_received(self, exc: Exception) -> None: ...
 
 class SubprocessProtocol(BaseProtocol):
+    __slots__: tuple[()] = ()
     def pipe_data_received(self, fd: int, data: bytes) -> None: ...
     def pipe_connection_lost(self, fd: int, exc: Exception | None) -> None: ...
     def process_exited(self) -> None: ...
diff --git a/mypy/typeshed/stdlib/asyncio/runners.pyi b/mypy/typeshed/stdlib/asyncio/runners.pyi
index caf5e4996cf4..919e6521f8a1 100644
--- a/mypy/typeshed/stdlib/asyncio/runners.pyi
+++ b/mypy/typeshed/stdlib/asyncio/runners.pyi
@@ -26,7 +26,7 @@ if sys.version_info >= (3, 11):
 
 if sys.version_info >= (3, 12):
     def run(
-        main: Coroutine[Any, Any, _T], *, debug: bool | None = ..., loop_factory: Callable[[], AbstractEventLoop] | None = ...
+        main: Coroutine[Any, Any, _T], *, debug: bool | None = None, loop_factory: Callable[[], AbstractEventLoop] | None = None
     ) -> _T: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/asyncio/streams.pyi b/mypy/typeshed/stdlib/asyncio/streams.pyi
index bf8db0246ee2..33cffb11ed78 100644
--- a/mypy/typeshed/stdlib/asyncio/streams.pyi
+++ b/mypy/typeshed/stdlib/asyncio/streams.pyi
@@ -34,7 +34,7 @@ if sys.version_info >= (3, 10):
         port: int | str | None = None,
         *,
         limit: int = 65536,
-        ssl_handshake_timeout: float | None = ...,
+        ssl_handshake_timeout: float | None = None,
         **kwds: Any,
     ) -> tuple[StreamReader, StreamWriter]: ...
     async def start_server(
@@ -43,7 +43,7 @@ if sys.version_info >= (3, 10):
         port: int | str | None = None,
         *,
         limit: int = 65536,
-        ssl_handshake_timeout: float | None = ...,
+        ssl_handshake_timeout: float | None = None,
         **kwds: Any,
     ) -> Server: ...
 
@@ -54,7 +54,7 @@ else:
         *,
         loop: events.AbstractEventLoop | None = None,
         limit: int = 65536,
-        ssl_handshake_timeout: float | None = ...,
+        ssl_handshake_timeout: float | None = None,
         **kwds: Any,
     ) -> tuple[StreamReader, StreamWriter]: ...
     async def start_server(
@@ -64,7 +64,7 @@ else:
         *,
         loop: events.AbstractEventLoop | None = None,
         limit: int = 65536,
-        ssl_handshake_timeout: float | None = ...,
+        ssl_handshake_timeout: float | None = None,
         **kwds: Any,
     ) -> Server: ...
 
diff --git a/mypy/typeshed/stdlib/asyncio/subprocess.pyi b/mypy/typeshed/stdlib/asyncio/subprocess.pyi
index 50d75391f36d..ceee2b5b90a0 100644
--- a/mypy/typeshed/stdlib/asyncio/subprocess.pyi
+++ b/mypy/typeshed/stdlib/asyncio/subprocess.pyi
@@ -60,7 +60,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
@@ -92,7 +92,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
@@ -126,7 +126,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
@@ -157,7 +157,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
@@ -191,7 +191,7 @@ else:  # >= 3.9
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
@@ -222,7 +222,7 @@ else:  # >= 3.9
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         group: None | str | int = None,
         extra_groups: None | Collection[str | int] = None,
         user: None | str | int = None,
diff --git a/mypy/typeshed/stdlib/asyncio/tasks.pyi b/mypy/typeshed/stdlib/asyncio/tasks.pyi
index 4104b3ecfeee..1442f7400a9c 100644
--- a/mypy/typeshed/stdlib/asyncio/tasks.pyi
+++ b/mypy/typeshed/stdlib/asyncio/tasks.pyi
@@ -8,7 +8,7 @@ from _asyncio import (
     _unregister_task as _unregister_task,
 )
 from collections.abc import AsyncIterator, Awaitable, Coroutine, Generator, Iterable, Iterator
-from typing import Any, Literal, Protocol, TypeVar, overload, type_check_only
+from typing import Any, Final, Literal, Protocol, TypeVar, overload, type_check_only
 from typing_extensions import TypeAlias
 
 from . import _CoroutineLike
@@ -82,9 +82,9 @@ else:
 
 _TaskYieldType: TypeAlias = Future[object] | None
 
-FIRST_COMPLETED = concurrent.futures.FIRST_COMPLETED
-FIRST_EXCEPTION = concurrent.futures.FIRST_EXCEPTION
-ALL_COMPLETED = concurrent.futures.ALL_COMPLETED
+FIRST_COMPLETED: Final = concurrent.futures.FIRST_COMPLETED
+FIRST_EXCEPTION: Final = concurrent.futures.FIRST_EXCEPTION
+ALL_COMPLETED: Final = concurrent.futures.ALL_COMPLETED
 
 if sys.version_info >= (3, 13):
     @type_check_only
diff --git a/mypy/typeshed/stdlib/asyncio/transports.pyi b/mypy/typeshed/stdlib/asyncio/transports.pyi
index bce54897f18f..cc870d5e0b9a 100644
--- a/mypy/typeshed/stdlib/asyncio/transports.pyi
+++ b/mypy/typeshed/stdlib/asyncio/transports.pyi
@@ -8,6 +8,7 @@ from typing import Any
 __all__ = ("BaseTransport", "ReadTransport", "WriteTransport", "Transport", "DatagramTransport", "SubprocessTransport")
 
 class BaseTransport:
+    __slots__ = ("_extra",)
     def __init__(self, extra: Mapping[str, Any] | None = None) -> None: ...
     def get_extra_info(self, name: str, default: Any = None) -> Any: ...
     def is_closing(self) -> bool: ...
@@ -16,11 +17,13 @@ class BaseTransport:
     def get_protocol(self) -> BaseProtocol: ...
 
 class ReadTransport(BaseTransport):
+    __slots__ = ()
     def is_reading(self) -> bool: ...
     def pause_reading(self) -> None: ...
     def resume_reading(self) -> None: ...
 
 class WriteTransport(BaseTransport):
+    __slots__ = ()
     def set_write_buffer_limits(self, high: int | None = None, low: int | None = None) -> None: ...
     def get_write_buffer_size(self) -> int: ...
     def get_write_buffer_limits(self) -> tuple[int, int]: ...
@@ -32,13 +35,16 @@ class WriteTransport(BaseTransport):
     def can_write_eof(self) -> bool: ...
     def abort(self) -> None: ...
 
-class Transport(ReadTransport, WriteTransport): ...
+class Transport(ReadTransport, WriteTransport):
+    __slots__ = ()
 
 class DatagramTransport(BaseTransport):
+    __slots__ = ()
     def sendto(self, data: bytes | bytearray | memoryview, addr: _Address | None = None) -> None: ...
     def abort(self) -> None: ...
 
 class SubprocessTransport(BaseTransport):
+    __slots__ = ()
     def get_pid(self) -> int: ...
     def get_returncode(self) -> int | None: ...
     def get_pipe_transport(self, fd: int) -> BaseTransport | None: ...
@@ -47,4 +53,5 @@ class SubprocessTransport(BaseTransport):
     def kill(self) -> None: ...
 
 class _FlowControlMixin(Transport):
+    __slots__ = ("_loop", "_protocol_paused", "_high_water", "_low_water")
     def __init__(self, extra: Mapping[str, Any] | None = None, loop: AbstractEventLoop | None = None) -> None: ...
diff --git a/mypy/typeshed/stdlib/asyncio/trsock.pyi b/mypy/typeshed/stdlib/asyncio/trsock.pyi
index 4dacbbd49399..492f1e42adf2 100644
--- a/mypy/typeshed/stdlib/asyncio/trsock.pyi
+++ b/mypy/typeshed/stdlib/asyncio/trsock.pyi
@@ -14,6 +14,7 @@ _WriteBuffer: TypeAlias = bytearray | memoryview
 _CMSG: TypeAlias = tuple[int, int, bytes]
 
 class TransportSocket:
+    __slots__ = ("_sock",)
     def __init__(self, sock: socket.socket) -> None: ...
     @property
     def family(self) -> int: ...
@@ -62,7 +63,7 @@ class TransportSocket:
         @deprecated("Removed in Python 3.11")
         def makefile(self) -> BinaryIO: ...
         @deprecated("Rmoved in Python 3.11")
-        def sendfile(self, file: BinaryIO, offset: int = ..., count: int | None = ...) -> int: ...
+        def sendfile(self, file: BinaryIO, offset: int = 0, count: int | None = None) -> int: ...
         @deprecated("Removed in Python 3.11")
         def close(self) -> None: ...
         @deprecated("Removed in Python 3.11")
@@ -70,17 +71,22 @@ class TransportSocket:
         if sys.platform == "linux":
             @deprecated("Removed in Python 3.11")
             def sendmsg_afalg(
-                self, msg: Iterable[ReadableBuffer] = ..., *, op: int, iv: Any = ..., assoclen: int = ..., flags: int = ...
+                self, msg: Iterable[ReadableBuffer] = ..., *, op: int, iv: Any = ..., assoclen: int = ..., flags: int = 0
             ) -> int: ...
         else:
             @deprecated("Removed in Python 3.11.")
             def sendmsg_afalg(
-                self, msg: Iterable[ReadableBuffer] = ..., *, op: int, iv: Any = ..., assoclen: int = ..., flags: int = ...
+                self, msg: Iterable[ReadableBuffer] = ..., *, op: int, iv: Any = ..., assoclen: int = ..., flags: int = 0
             ) -> NoReturn: ...
 
         @deprecated("Removed in Python 3.11.")
         def sendmsg(
-            self, buffers: Iterable[ReadableBuffer], ancdata: Iterable[_CMSG] = ..., flags: int = ..., address: _Address = ..., /
+            self,
+            buffers: Iterable[ReadableBuffer],
+            ancdata: Iterable[_CMSG] = ...,
+            flags: int = 0,
+            address: _Address | None = None,
+            /,
         ) -> int: ...
         @overload
         @deprecated("Removed in Python 3.11.")
@@ -89,9 +95,9 @@ class TransportSocket:
         @deprecated("Removed in Python 3.11.")
         def sendto(self, data: ReadableBuffer, flags: int, address: _Address) -> int: ...
         @deprecated("Removed in Python 3.11.")
-        def send(self, data: ReadableBuffer, flags: int = ...) -> int: ...
+        def send(self, data: ReadableBuffer, flags: int = 0) -> int: ...
         @deprecated("Removed in Python 3.11.")
-        def sendall(self, data: ReadableBuffer, flags: int = ...) -> None: ...
+        def sendall(self, data: ReadableBuffer, flags: int = 0) -> None: ...
         @deprecated("Removed in Python 3.11.")
         def set_inheritable(self, inheritable: bool) -> None: ...
         if sys.platform == "win32":
@@ -102,19 +108,19 @@ class TransportSocket:
             def share(self, process_id: int) -> NoReturn: ...
 
         @deprecated("Removed in Python 3.11.")
-        def recv_into(self, buffer: _WriteBuffer, nbytes: int = ..., flags: int = ...) -> int: ...
+        def recv_into(self, buffer: _WriteBuffer, nbytes: int = 0, flags: int = 0) -> int: ...
         @deprecated("Removed in Python 3.11.")
-        def recvfrom_into(self, buffer: _WriteBuffer, nbytes: int = ..., flags: int = ...) -> tuple[int, _RetAddress]: ...
+        def recvfrom_into(self, buffer: _WriteBuffer, nbytes: int = 0, flags: int = 0) -> tuple[int, _RetAddress]: ...
         @deprecated("Removed in Python 3.11.")
         def recvmsg_into(
-            self, buffers: Iterable[_WriteBuffer], ancbufsize: int = ..., flags: int = ..., /
+            self, buffers: Iterable[_WriteBuffer], ancbufsize: int = 0, flags: int = 0, /
         ) -> tuple[int, list[_CMSG], int, Any]: ...
         @deprecated("Removed in Python 3.11.")
-        def recvmsg(self, bufsize: int, ancbufsize: int = ..., flags: int = ..., /) -> tuple[bytes, list[_CMSG], int, Any]: ...
+        def recvmsg(self, bufsize: int, ancbufsize: int = 0, flags: int = 0, /) -> tuple[bytes, list[_CMSG], int, Any]: ...
         @deprecated("Removed in Python 3.11.")
-        def recvfrom(self, bufsize: int, flags: int = ...) -> tuple[bytes, _RetAddress]: ...
+        def recvfrom(self, bufsize: int, flags: int = 0) -> tuple[bytes, _RetAddress]: ...
         @deprecated("Removed in Python 3.11.")
-        def recv(self, bufsize: int, flags: int = ...) -> bytes: ...
+        def recv(self, bufsize: int, flags: int = 0) -> bytes: ...
         @deprecated("Removed in Python 3.11.")
         def __enter__(self) -> socket.socket: ...
         @deprecated("Removed in Python 3.11.")
diff --git a/mypy/typeshed/stdlib/asyncio/unix_events.pyi b/mypy/typeshed/stdlib/asyncio/unix_events.pyi
index b2bf22a27677..9071ee9a2fa7 100644
--- a/mypy/typeshed/stdlib/asyncio/unix_events.pyi
+++ b/mypy/typeshed/stdlib/asyncio/unix_events.pyi
@@ -48,7 +48,7 @@ if sys.platform != "win32":
 # So, it is special cased.
 if sys.version_info < (3, 14):
     if sys.version_info >= (3, 12):
-        @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+        @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
         class AbstractChildWatcher:
             @abstractmethod
             def add_child_handler(
@@ -100,7 +100,7 @@ if sys.platform != "win32":
                 def is_active(self) -> bool: ...
                 def attach_loop(self, loop: events.AbstractEventLoop | None) -> None: ...
 
-            @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             class SafeChildWatcher(BaseChildWatcher):
                 def __enter__(self) -> Self: ...
                 def __exit__(
@@ -111,7 +111,7 @@ if sys.platform != "win32":
                 ) -> None: ...
                 def remove_child_handler(self, pid: int) -> bool: ...
 
-            @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             class FastChildWatcher(BaseChildWatcher):
                 def __enter__(self) -> Self: ...
                 def __exit__(
@@ -171,9 +171,9 @@ if sys.platform != "win32":
     else:
         class _UnixDefaultEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
             if sys.version_info >= (3, 12):
-                @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+                @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
                 def get_child_watcher(self) -> AbstractChildWatcher: ...
-                @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+                @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
                 def set_child_watcher(self, watcher: AbstractChildWatcher | None) -> None: ...
             else:
                 def get_child_watcher(self) -> AbstractChildWatcher: ...
@@ -191,7 +191,7 @@ if sys.platform != "win32":
 
     if sys.version_info < (3, 14):
         if sys.version_info >= (3, 12):
-            @deprecated("Deprecated as of Python 3.12; will be removed in Python 3.14")
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             class MultiLoopChildWatcher(AbstractChildWatcher):
                 def is_active(self) -> bool: ...
                 def close(self) -> None: ...
diff --git a/mypy/typeshed/stdlib/asyncio/windows_events.pyi b/mypy/typeshed/stdlib/asyncio/windows_events.pyi
index b454aca1f262..a32381bfb3e6 100644
--- a/mypy/typeshed/stdlib/asyncio/windows_events.pyi
+++ b/mypy/typeshed/stdlib/asyncio/windows_events.pyi
@@ -116,6 +116,6 @@ if sys.platform == "win32":
     if sys.version_info >= (3, 14):
         _DefaultEventLoopPolicy = _WindowsProactorEventLoopPolicy
     else:
-        DefaultEventLoopPolicy = WindowsSelectorEventLoopPolicy
+        DefaultEventLoopPolicy = WindowsProactorEventLoopPolicy
     if sys.version_info >= (3, 13):
         EventLoop = ProactorEventLoop
diff --git a/mypy/typeshed/stdlib/asyncio/windows_utils.pyi b/mypy/typeshed/stdlib/asyncio/windows_utils.pyi
index 4fa014532376..5cedd61b5f4a 100644
--- a/mypy/typeshed/stdlib/asyncio/windows_utils.pyi
+++ b/mypy/typeshed/stdlib/asyncio/windows_utils.pyi
@@ -9,8 +9,8 @@ if sys.platform == "win32":
     __all__ = ("pipe", "Popen", "PIPE", "PipeHandle")
 
     BUFSIZE: Final = 8192
-    PIPE = subprocess.PIPE
-    STDOUT = subprocess.STDOUT
+    PIPE: Final = subprocess.PIPE
+    STDOUT: Final = subprocess.STDOUT
     def pipe(*, duplex: bool = False, overlapped: tuple[bool, bool] = (True, True), bufsize: int = 8192) -> tuple[int, int]: ...
 
     class PipeHandle:
@@ -34,9 +34,9 @@ if sys.platform == "win32":
         def __new__(
             cls,
             args: subprocess._CMD,
-            stdin: subprocess._FILE | None = ...,
-            stdout: subprocess._FILE | None = ...,
-            stderr: subprocess._FILE | None = ...,
+            stdin: subprocess._FILE | None = None,
+            stdout: subprocess._FILE | None = None,
+            stderr: subprocess._FILE | None = None,
             **kwds: Any,
         ) -> Self: ...
         def __init__(
diff --git a/mypy/typeshed/stdlib/binascii.pyi b/mypy/typeshed/stdlib/binascii.pyi
index e09d335596fc..5606d5cdf74d 100644
--- a/mypy/typeshed/stdlib/binascii.pyi
+++ b/mypy/typeshed/stdlib/binascii.pyi
@@ -31,8 +31,8 @@ if sys.version_info < (3, 11):
 
 def crc_hqx(data: ReadableBuffer, crc: int, /) -> int: ...
 def crc32(data: ReadableBuffer, crc: int = 0, /) -> int: ...
-def b2a_hex(data: ReadableBuffer, sep: str | bytes = ..., bytes_per_sep: int = ...) -> bytes: ...
-def hexlify(data: ReadableBuffer, sep: str | bytes = ..., bytes_per_sep: int = ...) -> bytes: ...
+def b2a_hex(data: ReadableBuffer, sep: str | bytes = ..., bytes_per_sep: int = 1) -> bytes: ...
+def hexlify(data: ReadableBuffer, sep: str | bytes = ..., bytes_per_sep: int = 1) -> bytes: ...
 def a2b_hex(hexstr: _AsciiBuffer, /) -> bytes: ...
 def unhexlify(hexstr: _AsciiBuffer, /) -> bytes: ...
 
diff --git a/mypy/typeshed/stdlib/builtins.pyi b/mypy/typeshed/stdlib/builtins.pyi
index d7c0fe27c1ee..ca8d56cb4297 100644
--- a/mypy/typeshed/stdlib/builtins.pyi
+++ b/mypy/typeshed/stdlib/builtins.pyi
@@ -70,6 +70,7 @@ from typing_extensions import (  # noqa: Y023
     TypeIs,
     TypeVarTuple,
     deprecated,
+    disjoint_base,
 )
 
 if sys.version_info >= (3, 14):
@@ -102,6 +103,7 @@ _StopT_co = TypeVar("_StopT_co", covariant=True, default=_StartT_co)  #  slice[A
 # FIXME: https://github.com/python/typing/issues/213 (replace step=start|stop with step=start&stop)
 _StepT_co = TypeVar("_StepT_co", covariant=True, default=_StartT_co | _StopT_co)  #  slice[A,B] -> slice[A, B, A|B]
 
+@disjoint_base
 class object:
     __doc__: str | None
     __dict__: dict[str, Any]
@@ -137,6 +139,7 @@ class object:
     @classmethod
     def __subclasshook__(cls, subclass: type, /) -> bool: ...
 
+@disjoint_base
 class staticmethod(Generic[_P, _R_co]):
     @property
     def __func__(self) -> Callable[_P, _R_co]: ...
@@ -157,6 +160,7 @@ class staticmethod(Generic[_P, _R_co]):
         def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
         __annotate__: AnnotateFunc | None
 
+@disjoint_base
 class classmethod(Generic[_T, _P, _R_co]):
     @property
     def __func__(self) -> Callable[Concatenate[type[_T], _P], _R_co]: ...
@@ -176,6 +180,7 @@ class classmethod(Generic[_T, _P, _R_co]):
         def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
         __annotate__: AnnotateFunc | None
 
+@disjoint_base
 class type:
     # object.__base__ is None. Otherwise, it would be a type.
     @property
@@ -228,6 +233,7 @@ class type:
     if sys.version_info >= (3, 14):
         __annotate__: AnnotateFunc | None
 
+@disjoint_base
 class super:
     @overload
     def __init__(self, t: Any, obj: Any, /) -> None: ...
@@ -240,6 +246,7 @@ _PositiveInteger: TypeAlias = Literal[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
 _NegativeInteger: TypeAlias = Literal[-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20]
 _LiteralInteger = _PositiveInteger | _NegativeInteger | Literal[0]  # noqa: Y026  # TODO: Use TypeAlias once mypy bugs are fixed
 
+@disjoint_base
 class int:
     @overload
     def __new__(cls, x: ConvertibleToInt = ..., /) -> Self: ...
@@ -350,6 +357,7 @@ class int:
     def __index__(self) -> int: ...
     def __format__(self, format_spec: str, /) -> str: ...
 
+@disjoint_base
 class float:
     def __new__(cls, x: ConvertibleToFloat = ..., /) -> Self: ...
     def as_integer_ratio(self) -> tuple[int, int]: ...
@@ -415,6 +423,7 @@ class float:
         @classmethod
         def from_number(cls, number: float | SupportsIndex | SupportsFloat, /) -> Self: ...
 
+@disjoint_base
 class complex:
     # Python doesn't currently accept SupportsComplex for the second argument
     @overload
@@ -462,6 +471,7 @@ class _FormatMapMapping(Protocol):
 class _TranslateTable(Protocol):
     def __getitem__(self, key: int, /) -> str | int | None: ...
 
+@disjoint_base
 class str(Sequence[str]):
     @overload
     def __new__(cls, object: object = ...) -> Self: ...
@@ -549,6 +559,7 @@ class str(Sequence[str]):
     def __getnewargs__(self) -> tuple[str]: ...
     def __format__(self, format_spec: str, /) -> str: ...
 
+@disjoint_base
 class bytes(Sequence[int]):
     @overload
     def __new__(cls, o: Iterable[SupportsIndex] | SupportsIndex | SupportsBytes | ReadableBuffer, /) -> Self: ...
@@ -647,6 +658,7 @@ class bytes(Sequence[int]):
 
     def __buffer__(self, flags: int, /) -> memoryview: ...
 
+@disjoint_base
 class bytearray(MutableSequence[int]):
     @overload
     def __init__(self) -> None: ...
@@ -911,6 +923,8 @@ class slice(Generic[_StartT_co, _StopT_co, _StepT_co]):
 
     def indices(self, len: SupportsIndex, /) -> tuple[int, int, int]: ...
 
+# Making this a disjoint_base upsets pyright
+# @disjoint_base
 class tuple(Sequence[_T_co]):
     def __new__(cls, iterable: Iterable[_T_co] = ..., /) -> Self: ...
     def __len__(self) -> int: ...
@@ -987,6 +1001,7 @@ class function:
     # mypy uses `builtins.function.__get__` to represent methods, properties, and getset_descriptors so we type the return as Any.
     def __get__(self, instance: object, owner: type | None = None, /) -> Any: ...
 
+@disjoint_base
 class list(MutableSequence[_T]):
     @overload
     def __init__(self) -> None: ...
@@ -1041,6 +1056,7 @@ class list(MutableSequence[_T]):
     def __eq__(self, value: object, /) -> bool: ...
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
+@disjoint_base
 class dict(MutableMapping[_KT, _VT]):
     # __init__ should be kept roughly in line with `collections.UserDict.__init__`, which has similar semantics
     # Also multiprocessing.managers.SyncManager.dict()
@@ -1123,6 +1139,7 @@ class dict(MutableMapping[_KT, _VT]):
     @overload
     def __ior__(self, value: Iterable[tuple[_KT, _VT]], /) -> Self: ...
 
+@disjoint_base
 class set(MutableSet[_T]):
     @overload
     def __init__(self) -> None: ...
@@ -1162,6 +1179,7 @@ class set(MutableSet[_T]):
     __hash__: ClassVar[None]  # type: ignore[assignment]
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
+@disjoint_base
 class frozenset(AbstractSet[_T_co]):
     @overload
     def __new__(cls) -> Self: ...
@@ -1190,6 +1208,7 @@ class frozenset(AbstractSet[_T_co]):
     def __hash__(self) -> int: ...
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
+@disjoint_base
 class enumerate(Iterator[tuple[int, _T]]):
     def __new__(cls, iterable: Iterable[_T], start: int = 0) -> Self: ...
     def __iter__(self) -> Self: ...
@@ -1221,6 +1240,7 @@ class range(Sequence[int]):
     def __getitem__(self, key: slice, /) -> range: ...
     def __reversed__(self) -> Iterator[int]: ...
 
+@disjoint_base
 class property:
     fget: Callable[[Any], Any] | None
     fset: Callable[[Any, Any], None] | None
@@ -1384,6 +1404,7 @@ else:
 
 exit: _sitebuiltins.Quitter
 
+@disjoint_base
 class filter(Iterator[_T]):
     @overload
     def __new__(cls, function: None, iterable: Iterable[_T | None], /) -> Self: ...
@@ -1447,7 +1468,7 @@ def len(obj: Sized, /) -> int: ...
 license: _sitebuiltins._Printer
 
 def locals() -> dict[str, Any]: ...
-
+@disjoint_base
 class map(Iterator[_S]):
     # 3.14 adds `strict` argument.
     if sys.version_info >= (3, 14):
@@ -1754,6 +1775,7 @@ def pow(base: _SupportsSomeKindOfPow, exp: complex, mod: None = None) -> complex
 
 quit: _sitebuiltins.Quitter
 
+@disjoint_base
 class reversed(Iterator[_T]):
     @overload
     def __new__(cls, sequence: Reversible[_T], /) -> Iterator[_T]: ...  # type: ignore[misc]
@@ -1817,7 +1839,7 @@ def sum(iterable: Iterable[_AddableT1], /, start: _AddableT2) -> _AddableT1 | _A
 def vars(object: type, /) -> types.MappingProxyType[str, Any]: ...
 @overload
 def vars(object: Any = ..., /) -> dict[str, Any]: ...
-
+@disjoint_base
 class zip(Iterator[_T_co]):
     if sys.version_info >= (3, 10):
         @overload
@@ -1921,6 +1943,7 @@ else:
 
     Ellipsis: ellipsis
 
+@disjoint_base
 class BaseException:
     args: tuple[Any, ...]
     __cause__: BaseException | None
@@ -1939,14 +1962,17 @@ class BaseException:
 class GeneratorExit(BaseException): ...
 class KeyboardInterrupt(BaseException): ...
 
+@disjoint_base
 class SystemExit(BaseException):
     code: sys._ExitCode
 
 class Exception(BaseException): ...
 
+@disjoint_base
 class StopIteration(Exception):
     value: Any
 
+@disjoint_base
 class OSError(Exception):
     errno: int | None
     strerror: str | None
@@ -1964,15 +1990,20 @@ if sys.platform == "win32":
 class ArithmeticError(Exception): ...
 class AssertionError(Exception): ...
 
-class AttributeError(Exception):
-    if sys.version_info >= (3, 10):
+if sys.version_info >= (3, 10):
+    @disjoint_base
+    class AttributeError(Exception):
         def __init__(self, *args: object, name: str | None = ..., obj: object = ...) -> None: ...
         name: str
         obj: object
 
+else:
+    class AttributeError(Exception): ...
+
 class BufferError(Exception): ...
 class EOFError(Exception): ...
 
+@disjoint_base
 class ImportError(Exception):
     def __init__(self, *args: object, name: str | None = ..., path: str | None = ...) -> None: ...
     name: str | None
@@ -1984,15 +2015,20 @@ class ImportError(Exception):
 class LookupError(Exception): ...
 class MemoryError(Exception): ...
 
-class NameError(Exception):
-    if sys.version_info >= (3, 10):
+if sys.version_info >= (3, 10):
+    @disjoint_base
+    class NameError(Exception):
         def __init__(self, *args: object, name: str | None = ...) -> None: ...
         name: str
 
+else:
+    class NameError(Exception): ...
+
 class ReferenceError(Exception): ...
 class RuntimeError(Exception): ...
 class StopAsyncIteration(Exception): ...
 
+@disjoint_base
 class SyntaxError(Exception):
     msg: str
     filename: str | None
@@ -2056,6 +2092,7 @@ class IndentationError(SyntaxError): ...
 class TabError(IndentationError): ...
 class UnicodeError(ValueError): ...
 
+@disjoint_base
 class UnicodeDecodeError(UnicodeError):
     encoding: str
     object: bytes
@@ -2064,6 +2101,7 @@ class UnicodeDecodeError(UnicodeError):
     reason: str
     def __init__(self, encoding: str, object: ReadableBuffer, start: int, end: int, reason: str, /) -> None: ...
 
+@disjoint_base
 class UnicodeEncodeError(UnicodeError):
     encoding: str
     object: str
@@ -2072,6 +2110,7 @@ class UnicodeEncodeError(UnicodeError):
     reason: str
     def __init__(self, encoding: str, object: str, start: int, end: int, reason: str, /) -> None: ...
 
+@disjoint_base
 class UnicodeTranslateError(UnicodeError):
     encoding: None
     object: str
@@ -2102,6 +2141,7 @@ if sys.version_info >= (3, 11):
     _ExceptionT = TypeVar("_ExceptionT", bound=Exception)
 
     # See `check_exception_group.py` for use-cases and comments.
+    @disjoint_base
     class BaseExceptionGroup(BaseException, Generic[_BaseExceptionT_co]):
         def __new__(cls, message: str, exceptions: Sequence[_BaseExceptionT_co], /) -> Self: ...
         def __init__(self, message: str, exceptions: Sequence[_BaseExceptionT_co], /) -> None: ...
diff --git a/mypy/typeshed/stdlib/calendar.pyi b/mypy/typeshed/stdlib/calendar.pyi
index cabf3b881c30..d00f0d5d2bce 100644
--- a/mypy/typeshed/stdlib/calendar.pyi
+++ b/mypy/typeshed/stdlib/calendar.pyi
@@ -167,18 +167,18 @@ if sys.version_info >= (3, 12):
         NOVEMBER = 11
         DECEMBER = 12
 
-    JANUARY = Month.JANUARY
-    FEBRUARY = Month.FEBRUARY
-    MARCH = Month.MARCH
-    APRIL = Month.APRIL
-    MAY = Month.MAY
-    JUNE = Month.JUNE
-    JULY = Month.JULY
-    AUGUST = Month.AUGUST
-    SEPTEMBER = Month.SEPTEMBER
-    OCTOBER = Month.OCTOBER
-    NOVEMBER = Month.NOVEMBER
-    DECEMBER = Month.DECEMBER
+    JANUARY: Final = Month.JANUARY
+    FEBRUARY: Final = Month.FEBRUARY
+    MARCH: Final = Month.MARCH
+    APRIL: Final = Month.APRIL
+    MAY: Final = Month.MAY
+    JUNE: Final = Month.JUNE
+    JULY: Final = Month.JULY
+    AUGUST: Final = Month.AUGUST
+    SEPTEMBER: Final = Month.SEPTEMBER
+    OCTOBER: Final = Month.OCTOBER
+    NOVEMBER: Final = Month.NOVEMBER
+    DECEMBER: Final = Month.DECEMBER
 
     class Day(enum.IntEnum):
         MONDAY = 0
@@ -189,13 +189,13 @@ if sys.version_info >= (3, 12):
         SATURDAY = 5
         SUNDAY = 6
 
-    MONDAY = Day.MONDAY
-    TUESDAY = Day.TUESDAY
-    WEDNESDAY = Day.WEDNESDAY
-    THURSDAY = Day.THURSDAY
-    FRIDAY = Day.FRIDAY
-    SATURDAY = Day.SATURDAY
-    SUNDAY = Day.SUNDAY
+    MONDAY: Final = Day.MONDAY
+    TUESDAY: Final = Day.TUESDAY
+    WEDNESDAY: Final = Day.WEDNESDAY
+    THURSDAY: Final = Day.THURSDAY
+    FRIDAY: Final = Day.FRIDAY
+    SATURDAY: Final = Day.SATURDAY
+    SUNDAY: Final = Day.SUNDAY
 else:
     MONDAY: Final = 0
     TUESDAY: Final = 1
diff --git a/mypy/typeshed/stdlib/cgi.pyi b/mypy/typeshed/stdlib/cgi.pyi
index a7a95a139330..0f9d4343b630 100644
--- a/mypy/typeshed/stdlib/cgi.pyi
+++ b/mypy/typeshed/stdlib/cgi.pyi
@@ -1,3 +1,4 @@
+import os
 from _typeshed import SupportsContainsAndGetItem, SupportsGetItem, SupportsItemAccess, Unused
 from builtins import list as _list, type as _type
 from collections.abc import Iterable, Iterator, Mapping
@@ -23,7 +24,7 @@ __all__ = [
 
 def parse(
     fp: IO[Any] | None = None,
-    environ: SupportsItemAccess[str, str] = ...,
+    environ: SupportsItemAccess[str, str] = os.environ,
     keep_blank_values: bool = ...,
     strict_parsing: bool = ...,
     separator: str = "&",
@@ -37,8 +38,8 @@ class _Environ(Protocol):
     def keys(self) -> Iterable[str]: ...
 
 def parse_header(line: str) -> tuple[str, dict[str, str]]: ...
-def test(environ: _Environ = ...) -> None: ...
-def print_environ(environ: _Environ = ...) -> None: ...
+def test(environ: _Environ = os.environ) -> None: ...
+def print_environ(environ: _Environ = os.environ) -> None: ...
 def print_form(form: dict[str, Any]) -> None: ...
 def print_directory() -> None: ...
 def print_environ_usage() -> None: ...
@@ -85,7 +86,7 @@ class FieldStorage:
         fp: IO[Any] | None = None,
         headers: Mapping[str, str] | Message | None = None,
         outerboundary: bytes = b"",
-        environ: SupportsContainsAndGetItem[str, str] = ...,
+        environ: SupportsContainsAndGetItem[str, str] = os.environ,
         keep_blank_values: int = 0,
         strict_parsing: int = 0,
         limit: int | None = None,
diff --git a/mypy/typeshed/stdlib/codecs.pyi b/mypy/typeshed/stdlib/codecs.pyi
index 15e184fc1038..fa4d4fd4ba92 100644
--- a/mypy/typeshed/stdlib/codecs.pyi
+++ b/mypy/typeshed/stdlib/codecs.pyi
@@ -1,10 +1,11 @@
+import sys
 import types
 from _codecs import *
 from _typeshed import ReadableBuffer
 from abc import abstractmethod
 from collections.abc import Callable, Generator, Iterable
 from typing import Any, BinaryIO, ClassVar, Final, Literal, Protocol, TextIO, overload, type_check_only
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 __all__ = [
     "register",
@@ -122,33 +123,64 @@ class _IncrementalDecoder(Protocol):
 class _BufferedIncrementalDecoder(Protocol):
     def __call__(self, errors: str = ...) -> BufferedIncrementalDecoder: ...
 
-class CodecInfo(tuple[_Encoder, _Decoder, _StreamReader, _StreamWriter]):
-    _is_text_encoding: bool
-    @property
-    def encode(self) -> _Encoder: ...
-    @property
-    def decode(self) -> _Decoder: ...
-    @property
-    def streamreader(self) -> _StreamReader: ...
-    @property
-    def streamwriter(self) -> _StreamWriter: ...
-    @property
-    def incrementalencoder(self) -> _IncrementalEncoder: ...
-    @property
-    def incrementaldecoder(self) -> _IncrementalDecoder: ...
-    name: str
-    def __new__(
-        cls,
-        encode: _Encoder,
-        decode: _Decoder,
-        streamreader: _StreamReader | None = None,
-        streamwriter: _StreamWriter | None = None,
-        incrementalencoder: _IncrementalEncoder | None = None,
-        incrementaldecoder: _IncrementalDecoder | None = None,
-        name: str | None = None,
-        *,
-        _is_text_encoding: bool | None = None,
-    ) -> Self: ...
+if sys.version_info >= (3, 12):
+    class CodecInfo(tuple[_Encoder, _Decoder, _StreamReader, _StreamWriter]):
+        _is_text_encoding: bool
+        @property
+        def encode(self) -> _Encoder: ...
+        @property
+        def decode(self) -> _Decoder: ...
+        @property
+        def streamreader(self) -> _StreamReader: ...
+        @property
+        def streamwriter(self) -> _StreamWriter: ...
+        @property
+        def incrementalencoder(self) -> _IncrementalEncoder: ...
+        @property
+        def incrementaldecoder(self) -> _IncrementalDecoder: ...
+        name: str
+        def __new__(
+            cls,
+            encode: _Encoder,
+            decode: _Decoder,
+            streamreader: _StreamReader | None = None,
+            streamwriter: _StreamWriter | None = None,
+            incrementalencoder: _IncrementalEncoder | None = None,
+            incrementaldecoder: _IncrementalDecoder | None = None,
+            name: str | None = None,
+            *,
+            _is_text_encoding: bool | None = None,
+        ) -> Self: ...
+
+else:
+    @disjoint_base
+    class CodecInfo(tuple[_Encoder, _Decoder, _StreamReader, _StreamWriter]):
+        _is_text_encoding: bool
+        @property
+        def encode(self) -> _Encoder: ...
+        @property
+        def decode(self) -> _Decoder: ...
+        @property
+        def streamreader(self) -> _StreamReader: ...
+        @property
+        def streamwriter(self) -> _StreamWriter: ...
+        @property
+        def incrementalencoder(self) -> _IncrementalEncoder: ...
+        @property
+        def incrementaldecoder(self) -> _IncrementalDecoder: ...
+        name: str
+        def __new__(
+            cls,
+            encode: _Encoder,
+            decode: _Decoder,
+            streamreader: _StreamReader | None = None,
+            streamwriter: _StreamWriter | None = None,
+            incrementalencoder: _IncrementalEncoder | None = None,
+            incrementaldecoder: _IncrementalDecoder | None = None,
+            name: str | None = None,
+            *,
+            _is_text_encoding: bool | None = None,
+        ) -> Self: ...
 
 def getencoder(encoding: str) -> _Encoder: ...
 def getdecoder(encoding: str) -> _Decoder: ...
diff --git a/mypy/typeshed/stdlib/collections/__init__.pyi b/mypy/typeshed/stdlib/collections/__init__.pyi
index df9449ef4c9b..8636e6cdbdc3 100644
--- a/mypy/typeshed/stdlib/collections/__init__.pyi
+++ b/mypy/typeshed/stdlib/collections/__init__.pyi
@@ -3,7 +3,7 @@ from _collections_abc import dict_items, dict_keys, dict_values
 from _typeshed import SupportsItems, SupportsKeysAndGetItem, SupportsRichComparison, SupportsRichComparisonT
 from types import GenericAlias
 from typing import Any, ClassVar, Generic, NoReturn, SupportsIndex, TypeVar, final, overload, type_check_only
-from typing_extensions import Self
+from typing_extensions import Self, disjoint_base
 
 if sys.version_info >= (3, 10):
     from collections.abc import (
@@ -231,6 +231,7 @@ class UserString(Sequence[UserString]):
     def upper(self) -> Self: ...
     def zfill(self, width: int) -> Self: ...
 
+@disjoint_base
 class deque(MutableSequence[_T]):
     @property
     def maxlen(self) -> int | None: ...
@@ -356,6 +357,7 @@ class _odict_items(dict_items[_KT_co, _VT_co]):  # type: ignore[misc]  # pyright
 class _odict_values(dict_values[_KT_co, _VT_co]):  # type: ignore[misc]  # pyright: ignore[reportGeneralTypeIssues]
     def __reversed__(self) -> Iterator[_VT_co]: ...
 
+@disjoint_base
 class OrderedDict(dict[_KT, _VT]):
     def popitem(self, last: bool = True) -> tuple[_KT, _VT]: ...
     def move_to_end(self, key: _KT, last: bool = True) -> None: ...
@@ -395,6 +397,7 @@ class OrderedDict(dict[_KT, _VT]):
     @overload
     def __ror__(self, value: dict[_T1, _T2], /) -> OrderedDict[_KT | _T1, _VT | _T2]: ...  # type: ignore[misc]
 
+@disjoint_base
 class defaultdict(dict[_KT, _VT]):
     default_factory: Callable[[], _VT] | None
     @overload
@@ -477,9 +480,15 @@ class ChainMap(MutableMapping[_KT, _VT]):
     __copy__ = copy
     # All arguments to `fromkeys` are passed to `dict.fromkeys` at runtime,
     # so the signature should be kept in line with `dict.fromkeys`.
-    @classmethod
-    @overload
-    def fromkeys(cls, iterable: Iterable[_T]) -> ChainMap[_T, Any | None]: ...
+    if sys.version_info >= (3, 13):
+        @classmethod
+        @overload
+        def fromkeys(cls, iterable: Iterable[_T], /) -> ChainMap[_T, Any | None]: ...
+    else:
+        @classmethod
+        @overload
+        def fromkeys(cls, iterable: Iterable[_T]) -> ChainMap[_T, Any | None]: ...
+
     @classmethod
     @overload
     # Special-case None: the user probably wants to add non-None values later.
diff --git a/mypy/typeshed/stdlib/colorsys.pyi b/mypy/typeshed/stdlib/colorsys.pyi
index 7842f80284ef..4afcb5392b58 100644
--- a/mypy/typeshed/stdlib/colorsys.pyi
+++ b/mypy/typeshed/stdlib/colorsys.pyi
@@ -1,3 +1,5 @@
+from typing import Final
+
 __all__ = ["rgb_to_yiq", "yiq_to_rgb", "rgb_to_hls", "hls_to_rgb", "rgb_to_hsv", "hsv_to_rgb"]
 
 def rgb_to_yiq(r: float, g: float, b: float) -> tuple[float, float, float]: ...
@@ -8,6 +10,6 @@ def rgb_to_hsv(r: float, g: float, b: float) -> tuple[float, float, float]: ...
 def hsv_to_rgb(h: float, s: float, v: float) -> tuple[float, float, float]: ...
 
 # TODO: undocumented
-ONE_SIXTH: float
-ONE_THIRD: float
-TWO_THIRD: float
+ONE_SIXTH: Final[float]
+ONE_THIRD: Final[float]
+TWO_THIRD: Final[float]
diff --git a/mypy/typeshed/stdlib/compression/zstd/__init__.pyi b/mypy/typeshed/stdlib/compression/zstd/__init__.pyi
index 24a9633c488e..d5da4be03612 100644
--- a/mypy/typeshed/stdlib/compression/zstd/__init__.pyi
+++ b/mypy/typeshed/stdlib/compression/zstd/__init__.pyi
@@ -35,6 +35,7 @@ zstd_version_info: Final[tuple[int, int, int]]
 COMPRESSION_LEVEL_DEFAULT: Final = _zstd.ZSTD_CLEVEL_DEFAULT
 
 class FrameInfo:
+    __slots__ = ("decompressed_size", "dictionary_id")
     decompressed_size: int
     dictionary_id: int
     def __init__(self, decompressed_size: int, dictionary_id: int) -> None: ...
diff --git a/mypy/typeshed/stdlib/concurrent/futures/_base.pyi b/mypy/typeshed/stdlib/concurrent/futures/_base.pyi
index 4063027f3eed..be48a6e4289c 100644
--- a/mypy/typeshed/stdlib/concurrent/futures/_base.pyi
+++ b/mypy/typeshed/stdlib/concurrent/futures/_base.pyi
@@ -15,8 +15,7 @@ RUNNING: Final = "RUNNING"
 CANCELLED: Final = "CANCELLED"
 CANCELLED_AND_NOTIFIED: Final = "CANCELLED_AND_NOTIFIED"
 FINISHED: Final = "FINISHED"
-_FUTURE_STATES: list[str]
-_STATE_TO_DESCRIPTION_MAP: dict[str, str]
+_STATE_TO_DESCRIPTION_MAP: Final[dict[str, str]]
 LOGGER: Logger
 
 class Error(Exception): ...
diff --git a/mypy/typeshed/stdlib/concurrent/futures/process.pyi b/mypy/typeshed/stdlib/concurrent/futures/process.pyi
index 607990100369..071b3aba5d33 100644
--- a/mypy/typeshed/stdlib/concurrent/futures/process.pyi
+++ b/mypy/typeshed/stdlib/concurrent/futures/process.pyi
@@ -5,7 +5,7 @@ from multiprocessing.context import BaseContext, Process
 from multiprocessing.queues import Queue, SimpleQueue
 from threading import Lock, Semaphore, Thread
 from types import TracebackType
-from typing import Any, Generic, TypeVar, overload
+from typing import Any, Final, Generic, TypeVar, overload
 from typing_extensions import TypeVarTuple, Unpack
 from weakref import ref
 
@@ -28,9 +28,9 @@ class _ThreadWakeup:
 
 def _python_exit() -> None: ...
 
-EXTRA_QUEUED_CALLS: int
+EXTRA_QUEUED_CALLS: Final = 1
 
-_MAX_WINDOWS_WORKERS: int
+_MAX_WINDOWS_WORKERS: Final = 61
 
 class _RemoteTraceback(Exception):
     tb: str
diff --git a/mypy/typeshed/stdlib/concurrent/interpreters/_crossinterp.pyi b/mypy/typeshed/stdlib/concurrent/interpreters/_crossinterp.pyi
index b073aefa7ca7..7cf1ea34786e 100644
--- a/mypy/typeshed/stdlib/concurrent/interpreters/_crossinterp.pyi
+++ b/mypy/typeshed/stdlib/concurrent/interpreters/_crossinterp.pyi
@@ -12,6 +12,7 @@ if sys.version_info >= (3, 13):  # needed to satisfy pyright checks for Python <
     classonly = classmethod
 
     class UnboundItem:
+        __slots__ = ()
         def __new__(cls) -> Never: ...
         @classonly
         def singleton(cls, kind: str, module: str, name: str = "UNBOUND") -> Self: ...
diff --git a/mypy/typeshed/stdlib/concurrent/interpreters/_queues.pyi b/mypy/typeshed/stdlib/concurrent/interpreters/_queues.pyi
index 39a057ee9a7b..7493f87809c8 100644
--- a/mypy/typeshed/stdlib/concurrent/interpreters/_queues.pyi
+++ b/mypy/typeshed/stdlib/concurrent/interpreters/_queues.pyi
@@ -51,8 +51,8 @@ if sys.version_info >= (3, 13):  # needed to satisfy pyright checks for Python <
             timeout: SupportsIndex | None = None,
             *,
             unbounditems: _AnyUnbound | None = None,
-            _delay: float = ...,
+            _delay: float = 0.01,
         ) -> None: ...
         def put_nowait(self, obj: object, *, unbounditems: _AnyUnbound | None = None) -> None: ...
-        def get(self, timeout: SupportsIndex | None = None, *, _delay: float = ...) -> object: ...
+        def get(self, timeout: SupportsIndex | None = None, *, _delay: float = 0.01) -> object: ...
         def get_nowait(self) -> object: ...
diff --git a/mypy/typeshed/stdlib/configparser.pyi b/mypy/typeshed/stdlib/configparser.pyi
index b3a421003026..764a8a965ea2 100644
--- a/mypy/typeshed/stdlib/configparser.pyi
+++ b/mypy/typeshed/stdlib/configparser.pyi
@@ -449,10 +449,13 @@ class ParsingError(Error):
         def __init__(self, source: str) -> None: ...
     else:
         @overload
-        def __init__(self, source: str, filename: None = None) -> None: ...
+        def __init__(self, source: str) -> None: ...
+        @overload
+        @deprecated("The `filename` parameter removed in Python 3.12. Use `source` instead.")
+        def __init__(self, source: None, filename: str | None) -> None: ...
         @overload
         @deprecated("The `filename` parameter removed in Python 3.12. Use `source` instead.")
-        def __init__(self, source: None = None, filename: str = ...) -> None: ...
+        def __init__(self, source: None = None, *, filename: str | None) -> None: ...
 
     def append(self, lineno: int, line: str) -> None: ...
 
diff --git a/mypy/typeshed/stdlib/contextlib.pyi b/mypy/typeshed/stdlib/contextlib.pyi
index c616c1f5bf19..383a1b7f334b 100644
--- a/mypy/typeshed/stdlib/contextlib.pyi
+++ b/mypy/typeshed/stdlib/contextlib.pyi
@@ -47,6 +47,7 @@ _CM_EF = TypeVar("_CM_EF", bound=AbstractContextManager[Any, Any] | _ExitFunc)
 # allowlist for use as a Protocol.
 @runtime_checkable
 class AbstractContextManager(ABC, Protocol[_T_co, _ExitT_co]):  # type: ignore[misc]  # pyright: ignore[reportGeneralTypeIssues]
+    __slots__ = ()
     def __enter__(self) -> _T_co: ...
     @abstractmethod
     def __exit__(
@@ -58,6 +59,7 @@ class AbstractContextManager(ABC, Protocol[_T_co, _ExitT_co]):  # type: ignore[m
 # allowlist for use as a Protocol.
 @runtime_checkable
 class AbstractAsyncContextManager(ABC, Protocol[_T_co, _ExitT_co]):  # type: ignore[misc]  # pyright: ignore[reportGeneralTypeIssues]
+    __slots__ = ()
     async def __aenter__(self) -> _T_co: ...
     @abstractmethod
     async def __aexit__(
diff --git a/mypy/typeshed/stdlib/crypt.pyi b/mypy/typeshed/stdlib/crypt.pyi
index bd22b5f8daba..f92632196989 100644
--- a/mypy/typeshed/stdlib/crypt.pyi
+++ b/mypy/typeshed/stdlib/crypt.pyi
@@ -1,5 +1,6 @@
 import sys
 from typing import Final, NamedTuple, type_check_only
+from typing_extensions import disjoint_base
 
 if sys.platform != "win32":
     @type_check_only
@@ -9,7 +10,12 @@ if sys.platform != "win32":
         salt_chars: int
         total_size: int
 
-    class _Method(_MethodBase): ...
+    if sys.version_info >= (3, 12):
+        class _Method(_MethodBase): ...
+    else:
+        @disjoint_base
+        class _Method(_MethodBase): ...
+
     METHOD_CRYPT: Final[_Method]
     METHOD_MD5: Final[_Method]
     METHOD_SHA256: Final[_Method]
diff --git a/mypy/typeshed/stdlib/ctypes/__init__.pyi b/mypy/typeshed/stdlib/ctypes/__init__.pyi
index 15649da9ff73..9da972240abb 100644
--- a/mypy/typeshed/stdlib/ctypes/__init__.pyi
+++ b/mypy/typeshed/stdlib/ctypes/__init__.pyi
@@ -26,7 +26,7 @@ from _ctypes import (
 from _typeshed import StrPath
 from ctypes._endian import BigEndianStructure as BigEndianStructure, LittleEndianStructure as LittleEndianStructure
 from types import GenericAlias
-from typing import Any, ClassVar, Generic, Literal, TypeVar, overload, type_check_only
+from typing import Any, ClassVar, Final, Generic, Literal, TypeVar, overload, type_check_only
 from typing_extensions import Self, TypeAlias, deprecated
 
 if sys.platform == "win32":
@@ -55,7 +55,7 @@ if sys.version_info >= (3, 14):
 else:
     from _ctypes import POINTER as POINTER, pointer as pointer
 
-DEFAULT_MODE: int
+DEFAULT_MODE: Final[int]
 
 class ArgumentError(Exception): ...
 
@@ -162,8 +162,14 @@ def create_string_buffer(init: int | bytes, size: int | None = None) -> Array[c_
 c_buffer = create_string_buffer
 
 def create_unicode_buffer(init: int | str, size: int | None = None) -> Array[c_wchar]: ...
-@deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-def SetPointerType(pointer: type[_Pointer[Any]], cls: _CTypeBaseType) -> None: ...
+
+if sys.version_info >= (3, 13):
+    @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+    def SetPointerType(pointer: type[_Pointer[Any]], cls: _CTypeBaseType) -> None: ...
+
+else:
+    def SetPointerType(pointer: type[_Pointer[Any]], cls: _CTypeBaseType) -> None: ...
+
 def ARRAY(typ: _CT, len: int) -> Array[_CT]: ...  # Soft Deprecated, no plans to remove
 
 if sys.platform == "win32":
diff --git a/mypy/typeshed/stdlib/ctypes/_endian.pyi b/mypy/typeshed/stdlib/ctypes/_endian.pyi
index 144f5ba5dd40..97852f67aa6e 100644
--- a/mypy/typeshed/stdlib/ctypes/_endian.pyi
+++ b/mypy/typeshed/stdlib/ctypes/_endian.pyi
@@ -3,10 +3,14 @@ from ctypes import Structure, Union
 
 # At runtime, the native endianness is an alias for Structure,
 # while the other is a subclass with a metaclass added in.
-class BigEndianStructure(Structure): ...
+class BigEndianStructure(Structure):
+    __slots__ = ()
+
 class LittleEndianStructure(Structure): ...
 
 # Same thing for these: one is an alias of Union at runtime
 if sys.version_info >= (3, 11):
-    class BigEndianUnion(Union): ...
+    class BigEndianUnion(Union):
+        __slots__ = ()
+
     class LittleEndianUnion(Union): ...
diff --git a/mypy/typeshed/stdlib/ctypes/macholib/__init__.pyi b/mypy/typeshed/stdlib/ctypes/macholib/__init__.pyi
index bda5b5a7f4cc..c5dd95466063 100644
--- a/mypy/typeshed/stdlib/ctypes/macholib/__init__.pyi
+++ b/mypy/typeshed/stdlib/ctypes/macholib/__init__.pyi
@@ -1 +1,3 @@
-__version__: str
+from typing import Final
+
+__version__: Final[str]
diff --git a/mypy/typeshed/stdlib/ctypes/wintypes.pyi b/mypy/typeshed/stdlib/ctypes/wintypes.pyi
index e9ed0df24dd1..0f0d61a396d5 100644
--- a/mypy/typeshed/stdlib/ctypes/wintypes.pyi
+++ b/mypy/typeshed/stdlib/ctypes/wintypes.pyi
@@ -21,7 +21,7 @@ from ctypes import (
     c_wchar,
     c_wchar_p,
 )
-from typing import Any, TypeVar
+from typing import Any, Final, TypeVar
 from typing_extensions import Self, TypeAlias
 
 if sys.version_info >= (3, 12):
@@ -177,7 +177,7 @@ class MSG(Structure):
     pt: _CField[POINT, POINT, POINT]
 
 tagMSG = MSG
-MAX_PATH: int
+MAX_PATH: Final = 260
 
 class WIN32_FIND_DATAA(Structure):
     dwFileAttributes: _CIntLikeField[DWORD]
diff --git a/mypy/typeshed/stdlib/curses/__init__.pyi b/mypy/typeshed/stdlib/curses/__init__.pyi
index 5c157fd7c2f6..2c0231c13087 100644
--- a/mypy/typeshed/stdlib/curses/__init__.pyi
+++ b/mypy/typeshed/stdlib/curses/__init__.pyi
@@ -14,12 +14,12 @@ _T = TypeVar("_T")
 _P = ParamSpec("_P")
 
 # available after calling `curses.initscr()`
-LINES: int
-COLS: int
+LINES: Final[int]
+COLS: Final[int]
 
 # available after calling `curses.start_color()`
-COLORS: int
-COLOR_PAIRS: int
+COLORS: Final[int]
+COLOR_PAIRS: Final[int]
 
 def wrapper(func: Callable[Concatenate[window, _P], _T], /, *arg: _P.args, **kwds: _P.kwargs) -> _T: ...
 
diff --git a/mypy/typeshed/stdlib/curses/ascii.pyi b/mypy/typeshed/stdlib/curses/ascii.pyi
index 66efbe36a7df..0234434b8c3d 100644
--- a/mypy/typeshed/stdlib/curses/ascii.pyi
+++ b/mypy/typeshed/stdlib/curses/ascii.pyi
@@ -1,45 +1,45 @@
-from typing import TypeVar
+from typing import Final, TypeVar
 
 _CharT = TypeVar("_CharT", str, int)
 
-NUL: int
-SOH: int
-STX: int
-ETX: int
-EOT: int
-ENQ: int
-ACK: int
-BEL: int
-BS: int
-TAB: int
-HT: int
-LF: int
-NL: int
-VT: int
-FF: int
-CR: int
-SO: int
-SI: int
-DLE: int
-DC1: int
-DC2: int
-DC3: int
-DC4: int
-NAK: int
-SYN: int
-ETB: int
-CAN: int
-EM: int
-SUB: int
-ESC: int
-FS: int
-GS: int
-RS: int
-US: int
-SP: int
-DEL: int
+NUL: Final = 0x00
+SOH: Final = 0x01
+STX: Final = 0x02
+ETX: Final = 0x03
+EOT: Final = 0x04
+ENQ: Final = 0x05
+ACK: Final = 0x06
+BEL: Final = 0x07
+BS: Final = 0x08
+TAB: Final = 0x09
+HT: Final = 0x09
+LF: Final = 0x0A
+NL: Final = 0x0A
+VT: Final = 0x0B
+FF: Final = 0x0C
+CR: Final = 0x0D
+SO: Final = 0x0E
+SI: Final = 0x0F
+DLE: Final = 0x10
+DC1: Final = 0x11
+DC2: Final = 0x12
+DC3: Final = 0x13
+DC4: Final = 0x14
+NAK: Final = 0x15
+SYN: Final = 0x16
+ETB: Final = 0x17
+CAN: Final = 0x18
+EM: Final = 0x19
+SUB: Final = 0x1A
+ESC: Final = 0x1B
+FS: Final = 0x1C
+GS: Final = 0x1D
+RS: Final = 0x1E
+US: Final = 0x1F
+SP: Final = 0x20
+DEL: Final = 0x7F
 
-controlnames: list[int]
+controlnames: Final[list[int]]
 
 def isalnum(c: str | int) -> bool: ...
 def isalpha(c: str | int) -> bool: ...
diff --git a/mypy/typeshed/stdlib/dataclasses.pyi b/mypy/typeshed/stdlib/dataclasses.pyi
index b3183f57ebd2..3a1c8cb5d62d 100644
--- a/mypy/typeshed/stdlib/dataclasses.pyi
+++ b/mypy/typeshed/stdlib/dataclasses.pyi
@@ -5,7 +5,7 @@ from _typeshed import DataclassInstance
 from builtins import type as Type  # alias to avoid name clashes with fields named "type"
 from collections.abc import Callable, Iterable, Mapping
 from types import GenericAlias
-from typing import Any, Generic, Literal, Protocol, TypeVar, overload, type_check_only
+from typing import Any, Final, Generic, Literal, Protocol, TypeVar, overload, type_check_only
 from typing_extensions import Never, TypeIs
 
 _T = TypeVar("_T")
@@ -58,7 +58,7 @@ class _DataclassFactory(Protocol):
 class _MISSING_TYPE(enum.Enum):
     MISSING = enum.auto()
 
-MISSING = _MISSING_TYPE.MISSING
+MISSING: Final = _MISSING_TYPE.MISSING
 
 if sys.version_info >= (3, 10):
     class KW_ONLY: ...
@@ -170,6 +170,37 @@ class _DefaultFactory(Protocol[_T_co]):
     def __call__(self) -> _T_co: ...
 
 class Field(Generic[_T]):
+    if sys.version_info >= (3, 14):
+        __slots__ = (
+            "name",
+            "type",
+            "default",
+            "default_factory",
+            "repr",
+            "hash",
+            "init",
+            "compare",
+            "metadata",
+            "kw_only",
+            "doc",
+            "_field_type",
+        )
+    elif sys.version_info >= (3, 10):
+        __slots__ = (
+            "name",
+            "type",
+            "default",
+            "default_factory",
+            "repr",
+            "hash",
+            "init",
+            "compare",
+            "metadata",
+            "kw_only",
+            "_field_type",
+        )
+    else:
+        __slots__ = ("name", "type", "default", "default_factory", "repr", "hash", "init", "compare", "metadata", "_field_type")
     name: str
     type: Type[_T] | str | Any
     default: _T | Literal[_MISSING_TYPE.MISSING]
@@ -355,6 +386,7 @@ def is_dataclass(obj: object) -> TypeIs[DataclassInstance | type[DataclassInstan
 class FrozenInstanceError(AttributeError): ...
 
 class InitVar(Generic[_T]):
+    __slots__ = ("type",)
     type: Type[_T]
     def __init__(self, type: Type[_T]) -> None: ...
     @overload
diff --git a/mypy/typeshed/stdlib/datetime.pyi b/mypy/typeshed/stdlib/datetime.pyi
index c54de6159b51..8a0536c006d5 100644
--- a/mypy/typeshed/stdlib/datetime.pyi
+++ b/mypy/typeshed/stdlib/datetime.pyi
@@ -2,7 +2,7 @@ import sys
 from abc import abstractmethod
 from time import struct_time
 from typing import ClassVar, Final, NoReturn, SupportsIndex, final, overload, type_check_only
-from typing_extensions import CapsuleType, Self, TypeAlias, deprecated
+from typing_extensions import CapsuleType, Self, TypeAlias, deprecated, disjoint_base
 
 if sys.version_info >= (3, 11):
     __all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo", "MINYEAR", "MAXYEAR", "UTC")
@@ -51,6 +51,7 @@ class _IsoCalendarDate(tuple[int, int, int]):
     @property
     def weekday(self) -> int: ...
 
+@disjoint_base
 class date:
     min: ClassVar[date]
     max: ClassVar[date]
@@ -112,6 +113,7 @@ class date:
     def isoweekday(self) -> int: ...
     def isocalendar(self) -> _IsoCalendarDate: ...
 
+@disjoint_base
 class time:
     min: ClassVar[time]
     max: ClassVar[time]
@@ -191,6 +193,7 @@ class time:
 _Date: TypeAlias = date
 _Time: TypeAlias = time
 
+@disjoint_base
 class timedelta:
     min: ClassVar[timedelta]
     max: ClassVar[timedelta]
@@ -239,6 +242,7 @@ class timedelta:
     def __bool__(self) -> bool: ...
     def __hash__(self) -> int: ...
 
+@disjoint_base
 class datetime(date):
     min: ClassVar[datetime]
     max: ClassVar[datetime]
diff --git a/mypy/typeshed/stdlib/decimal.pyi b/mypy/typeshed/stdlib/decimal.pyi
index b85c00080092..2e06c2d1b724 100644
--- a/mypy/typeshed/stdlib/decimal.pyi
+++ b/mypy/typeshed/stdlib/decimal.pyi
@@ -27,7 +27,7 @@ from _decimal import (
 from collections.abc import Container, Sequence
 from types import TracebackType
 from typing import Any, ClassVar, Literal, NamedTuple, final, overload, type_check_only
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 if sys.version_info >= (3, 14):
     from _decimal import IEEE_CONTEXT_MAX_BITS as IEEE_CONTEXT_MAX_BITS, IEEEContext as IEEEContext
@@ -68,6 +68,7 @@ class Overflow(Inexact, Rounded): ...
 class Underflow(Inexact, Rounded, Subnormal): ...
 class FloatOperation(DecimalException, TypeError): ...
 
+@disjoint_base
 class Decimal:
     def __new__(cls, value: _DecimalNew = "0", context: Context | None = None) -> Self: ...
     if sys.version_info >= (3, 14):
@@ -173,6 +174,7 @@ class Decimal:
     def __deepcopy__(self, memo: Any, /) -> Self: ...
     def __format__(self, specifier: str, context: Context | None = None, /) -> str: ...
 
+@disjoint_base
 class Context:
     # TODO: Context doesn't allow you to delete *any* attributes from instances of the class at runtime,
     # even settable attributes like `prec` and `rounding`,
diff --git a/mypy/typeshed/stdlib/dis.pyi b/mypy/typeshed/stdlib/dis.pyi
index 86b6d01e3120..896b50fa9384 100644
--- a/mypy/typeshed/stdlib/dis.pyi
+++ b/mypy/typeshed/stdlib/dis.pyi
@@ -2,8 +2,8 @@ import sys
 import types
 from collections.abc import Callable, Iterator
 from opcode import *  # `dis` re-exports it as a part of public API
-from typing import IO, Any, NamedTuple
-from typing_extensions import Self, TypeAlias
+from typing import IO, Any, Final, NamedTuple
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 __all__ = [
     "code_info",
@@ -88,39 +88,45 @@ else:
         starts_line: int | None
         is_jump_target: bool
 
-class Instruction(_Instruction):
-    if sys.version_info < (3, 13):
+if sys.version_info >= (3, 12):
+    class Instruction(_Instruction):
+        if sys.version_info < (3, 13):
+            def _disassemble(self, lineno_width: int = 3, mark_as_current: bool = False, offset_width: int = 4) -> str: ...
+        if sys.version_info >= (3, 13):
+            @property
+            def oparg(self) -> int: ...
+            @property
+            def baseopcode(self) -> int: ...
+            @property
+            def baseopname(self) -> str: ...
+            @property
+            def cache_offset(self) -> int: ...
+            @property
+            def end_offset(self) -> int: ...
+            @property
+            def jump_target(self) -> int: ...
+            @property
+            def is_jump_target(self) -> bool: ...
+        if sys.version_info >= (3, 14):
+            @staticmethod
+            def make(
+                opname: str,
+                arg: int | None,
+                argval: Any,
+                argrepr: str,
+                offset: int,
+                start_offset: int,
+                starts_line: bool,
+                line_number: int | None,
+                label: int | None = None,
+                positions: Positions | None = None,
+                cache_info: list[tuple[str, int, Any]] | None = None,
+            ) -> Instruction: ...
+
+else:
+    @disjoint_base
+    class Instruction(_Instruction):
         def _disassemble(self, lineno_width: int = 3, mark_as_current: bool = False, offset_width: int = 4) -> str: ...
-    if sys.version_info >= (3, 13):
-        @property
-        def oparg(self) -> int: ...
-        @property
-        def baseopcode(self) -> int: ...
-        @property
-        def baseopname(self) -> str: ...
-        @property
-        def cache_offset(self) -> int: ...
-        @property
-        def end_offset(self) -> int: ...
-        @property
-        def jump_target(self) -> int: ...
-        @property
-        def is_jump_target(self) -> bool: ...
-    if sys.version_info >= (3, 14):
-        @staticmethod
-        def make(
-            opname: str,
-            arg: int | None,
-            argval: Any,
-            argrepr: str,
-            offset: int,
-            start_offset: int,
-            starts_line: bool,
-            line_number: int | None,
-            label: int | None = None,
-            positions: Positions | None = None,
-            cache_info: list[tuple[str, int, Any]] | None = None,
-        ) -> Instruction: ...
 
 class Bytecode:
     codeobj: types.CodeType
@@ -178,7 +184,7 @@ class Bytecode:
     def info(self) -> str: ...
     def dis(self) -> str: ...
 
-COMPILER_FLAG_NAMES: dict[int, str]
+COMPILER_FLAG_NAMES: Final[dict[int, str]]
 
 def findlabels(code: _HaveCodeType) -> list[int]: ...
 def findlinestarts(code: _HaveCodeType) -> Iterator[tuple[int, int]]: ...
diff --git a/mypy/typeshed/stdlib/distutils/file_util.pyi b/mypy/typeshed/stdlib/distutils/file_util.pyi
index 873d23ea7e50..c763f91a958d 100644
--- a/mypy/typeshed/stdlib/distutils/file_util.pyi
+++ b/mypy/typeshed/stdlib/distutils/file_util.pyi
@@ -29,10 +29,10 @@ def copy_file(
 ) -> tuple[_BytesPathT | bytes, bool]: ...
 @overload
 def move_file(
-    src: StrPath, dst: _StrPathT, verbose: bool | Literal[0, 1] = 0, dry_run: bool | Literal[0, 1] = 0
+    src: StrPath, dst: _StrPathT, verbose: bool | Literal[0, 1] = 1, dry_run: bool | Literal[0, 1] = 0
 ) -> _StrPathT | str: ...
 @overload
 def move_file(
-    src: BytesPath, dst: _BytesPathT, verbose: bool | Literal[0, 1] = 0, dry_run: bool | Literal[0, 1] = 0
+    src: BytesPath, dst: _BytesPathT, verbose: bool | Literal[0, 1] = 1, dry_run: bool | Literal[0, 1] = 0
 ) -> _BytesPathT | bytes: ...
 def write_file(filename: StrOrBytesPath, contents: Iterable[str]) -> None: ...
diff --git a/mypy/typeshed/stdlib/doctest.pyi b/mypy/typeshed/stdlib/doctest.pyi
index 562b5a5bdac9..1bb96e1a7786 100644
--- a/mypy/typeshed/stdlib/doctest.pyi
+++ b/mypy/typeshed/stdlib/doctest.pyi
@@ -3,7 +3,7 @@ import types
 import unittest
 from _typeshed import ExcInfo
 from collections.abc import Callable
-from typing import Any, NamedTuple, type_check_only
+from typing import Any, Final, NamedTuple, type_check_only
 from typing_extensions import Self, TypeAlias
 
 __all__ = [
@@ -57,29 +57,29 @@ else:
         failed: int
         attempted: int
 
-OPTIONFLAGS_BY_NAME: dict[str, int]
+OPTIONFLAGS_BY_NAME: Final[dict[str, int]]
 
 def register_optionflag(name: str) -> int: ...
 
-DONT_ACCEPT_TRUE_FOR_1: int
-DONT_ACCEPT_BLANKLINE: int
-NORMALIZE_WHITESPACE: int
-ELLIPSIS: int
-SKIP: int
-IGNORE_EXCEPTION_DETAIL: int
+DONT_ACCEPT_TRUE_FOR_1: Final = 1
+DONT_ACCEPT_BLANKLINE: Final = 2
+NORMALIZE_WHITESPACE: Final = 4
+ELLIPSIS: Final = 8
+SKIP: Final = 16
+IGNORE_EXCEPTION_DETAIL: Final = 32
 
-COMPARISON_FLAGS: int
+COMPARISON_FLAGS: Final = 63
 
-REPORT_UDIFF: int
-REPORT_CDIFF: int
-REPORT_NDIFF: int
-REPORT_ONLY_FIRST_FAILURE: int
-FAIL_FAST: int
+REPORT_UDIFF: Final = 64
+REPORT_CDIFF: Final = 128
+REPORT_NDIFF: Final = 256
+REPORT_ONLY_FIRST_FAILURE: Final = 512
+FAIL_FAST: Final = 1024
 
-REPORTING_FLAGS: int
+REPORTING_FLAGS: Final = 1984
 
-BLANKLINE_MARKER: str
-ELLIPSIS_MARKER: str
+BLANKLINE_MARKER: Final = "<BLANKLINE>"
+ELLIPSIS_MARKER: Final = "..."
 
 class Example:
     source: str
diff --git a/mypy/typeshed/stdlib/email/_header_value_parser.pyi b/mypy/typeshed/stdlib/email/_header_value_parser.pyi
index 95ada186c4ec..dededd006e5b 100644
--- a/mypy/typeshed/stdlib/email/_header_value_parser.pyi
+++ b/mypy/typeshed/stdlib/email/_header_value_parser.pyi
@@ -25,7 +25,7 @@ SPECIALSNL: Final[set[str]]
 def make_quoted_pairs(value: Any) -> str: ...
 def quote_string(value: Any) -> str: ...
 
-rfc2047_matcher: Pattern[str]
+rfc2047_matcher: Final[Pattern[str]]
 
 class TokenList(list[TokenList | Terminal]):
     token_type: str | None
diff --git a/mypy/typeshed/stdlib/email/charset.pyi b/mypy/typeshed/stdlib/email/charset.pyi
index 683daa468cf3..e1930835bbd1 100644
--- a/mypy/typeshed/stdlib/email/charset.pyi
+++ b/mypy/typeshed/stdlib/email/charset.pyi
@@ -4,9 +4,16 @@ from typing import ClassVar, Final, overload
 
 __all__ = ["Charset", "add_alias", "add_charset", "add_codec"]
 
-QP: Final[int]  # undocumented
-BASE64: Final[int]  # undocumented
-SHORTEST: Final[int]  # undocumented
+QP: Final = 1  # undocumented
+BASE64: Final = 2  # undocumented
+SHORTEST: Final = 3  # undocumented
+RFC2047_CHROME_LEN: Final = 7  # undocumented
+DEFAULT_CHARSET: Final = "us-ascii"  # undocumented
+UNKNOWN8BIT: Final = "unknown-8bit"  # undocumented
+EMPTYSTRING: Final = ""  # undocumented
+CHARSETS: Final[dict[str, tuple[int | None, int | None, str | None]]]
+ALIASES: Final[dict[str, str]]
+CODEC_MAP: Final[dict[str, str | None]]  # undocumented
 
 class Charset:
     input_charset: str
diff --git a/mypy/typeshed/stdlib/enum.pyi b/mypy/typeshed/stdlib/enum.pyi
index eb7d2e3819fd..4ac860f5e611 100644
--- a/mypy/typeshed/stdlib/enum.pyi
+++ b/mypy/typeshed/stdlib/enum.pyi
@@ -4,8 +4,8 @@ import types
 from _typeshed import SupportsKeysAndGetItem, Unused
 from builtins import property as _builtins_property
 from collections.abc import Callable, Iterable, Iterator, Mapping
-from typing import Any, Generic, Literal, TypeVar, overload
-from typing_extensions import Self, TypeAlias
+from typing import Any, Final, Generic, Literal, TypeVar, overload
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 __all__ = ["EnumMeta", "Enum", "IntEnum", "Flag", "IntFlag", "auto", "unique"]
 
@@ -228,16 +228,25 @@ class Enum(metaclass=EnumMeta):
 if sys.version_info >= (3, 11):
     class ReprEnum(Enum): ...
 
-if sys.version_info >= (3, 11):
-    _IntEnumBase = ReprEnum
+if sys.version_info >= (3, 12):
+    class IntEnum(int, ReprEnum):
+        _value_: int
+        @_magic_enum_attr
+        def value(self) -> int: ...
+        def __new__(cls, value: int) -> Self: ...
+
 else:
-    _IntEnumBase = Enum
+    if sys.version_info >= (3, 11):
+        _IntEnumBase = ReprEnum
+    else:
+        _IntEnumBase = Enum
 
-class IntEnum(int, _IntEnumBase):
-    _value_: int
-    @_magic_enum_attr
-    def value(self) -> int: ...
-    def __new__(cls, value: int) -> Self: ...
+    @disjoint_base
+    class IntEnum(int, _IntEnumBase):
+        _value_: int
+        @_magic_enum_attr
+        def value(self) -> int: ...
+        def __new__(cls, value: int) -> Self: ...
 
 def unique(enumeration: _EnumerationT) -> _EnumerationT: ...
 
@@ -277,9 +286,9 @@ if sys.version_info >= (3, 11):
         NAMED_FLAGS = "multi-flag aliases may not contain unnamed flags"
         UNIQUE = "one name per value"
 
-    CONTINUOUS = EnumCheck.CONTINUOUS
-    NAMED_FLAGS = EnumCheck.NAMED_FLAGS
-    UNIQUE = EnumCheck.UNIQUE
+    CONTINUOUS: Final = EnumCheck.CONTINUOUS
+    NAMED_FLAGS: Final = EnumCheck.NAMED_FLAGS
+    UNIQUE: Final = EnumCheck.UNIQUE
 
     class verify:
         def __init__(self, *checks: EnumCheck) -> None: ...
@@ -291,18 +300,31 @@ if sys.version_info >= (3, 11):
         EJECT = "eject"
         KEEP = "keep"
 
-    STRICT = FlagBoundary.STRICT
-    CONFORM = FlagBoundary.CONFORM
-    EJECT = FlagBoundary.EJECT
-    KEEP = FlagBoundary.KEEP
+    STRICT: Final = FlagBoundary.STRICT
+    CONFORM: Final = FlagBoundary.CONFORM
+    EJECT: Final = FlagBoundary.EJECT
+    KEEP: Final = FlagBoundary.KEEP
 
     def global_str(self: Enum) -> str: ...
     def global_enum(cls: _EnumerationT, update_str: bool = False) -> _EnumerationT: ...
     def global_enum_repr(self: Enum) -> str: ...
     def global_flag_repr(self: Flag) -> str: ...
 
-if sys.version_info >= (3, 11):
+if sys.version_info >= (3, 12):
+    # The body of the class is the same, but the base classes are different.
+    class IntFlag(int, ReprEnum, Flag, boundary=KEEP):  # type: ignore[misc]  # complaints about incompatible bases
+        def __new__(cls, value: int) -> Self: ...
+        def __or__(self, other: int) -> Self: ...
+        def __and__(self, other: int) -> Self: ...
+        def __xor__(self, other: int) -> Self: ...
+        def __invert__(self) -> Self: ...
+        __ror__ = __or__
+        __rand__ = __and__
+        __rxor__ = __xor__
+
+elif sys.version_info >= (3, 11):
     # The body of the class is the same, but the base classes are different.
+    @disjoint_base
     class IntFlag(int, ReprEnum, Flag, boundary=KEEP):  # type: ignore[misc]  # complaints about incompatible bases
         def __new__(cls, value: int) -> Self: ...
         def __or__(self, other: int) -> Self: ...
@@ -314,6 +336,7 @@ if sys.version_info >= (3, 11):
         __rxor__ = __xor__
 
 else:
+    @disjoint_base
     class IntFlag(int, Flag):  # type: ignore[misc]  # complaints about incompatible bases
         def __new__(cls, value: int) -> Self: ...
         def __or__(self, other: int) -> Self: ...
diff --git a/mypy/typeshed/stdlib/errno.pyi b/mypy/typeshed/stdlib/errno.pyi
index 3ba8b66d2865..4f19b5aee87e 100644
--- a/mypy/typeshed/stdlib/errno.pyi
+++ b/mypy/typeshed/stdlib/errno.pyi
@@ -1,225 +1,226 @@
 import sys
 from collections.abc import Mapping
+from typing import Final
 
 errorcode: Mapping[int, str]
 
-EPERM: int
-ENOENT: int
-ESRCH: int
-EINTR: int
-EIO: int
-ENXIO: int
-E2BIG: int
-ENOEXEC: int
-EBADF: int
-ECHILD: int
-EAGAIN: int
-ENOMEM: int
-EACCES: int
-EFAULT: int
-EBUSY: int
-EEXIST: int
-EXDEV: int
-ENODEV: int
-ENOTDIR: int
-EISDIR: int
-EINVAL: int
-ENFILE: int
-EMFILE: int
-ENOTTY: int
-ETXTBSY: int
-EFBIG: int
-ENOSPC: int
-ESPIPE: int
-EROFS: int
-EMLINK: int
-EPIPE: int
-EDOM: int
-ERANGE: int
-EDEADLK: int
-ENAMETOOLONG: int
-ENOLCK: int
-ENOSYS: int
-ENOTEMPTY: int
-ELOOP: int
-EWOULDBLOCK: int
-ENOMSG: int
-EIDRM: int
-ENOSTR: int
-ENODATA: int
-ETIME: int
-ENOSR: int
-EREMOTE: int
-ENOLINK: int
-EPROTO: int
-EBADMSG: int
-EOVERFLOW: int
-EILSEQ: int
-EUSERS: int
-ENOTSOCK: int
-EDESTADDRREQ: int
-EMSGSIZE: int
-EPROTOTYPE: int
-ENOPROTOOPT: int
-EPROTONOSUPPORT: int
-ESOCKTNOSUPPORT: int
-ENOTSUP: int
-EOPNOTSUPP: int
-EPFNOSUPPORT: int
-EAFNOSUPPORT: int
-EADDRINUSE: int
-EADDRNOTAVAIL: int
-ENETDOWN: int
-ENETUNREACH: int
-ENETRESET: int
-ECONNABORTED: int
-ECONNRESET: int
-ENOBUFS: int
-EISCONN: int
-ENOTCONN: int
-ESHUTDOWN: int
-ETOOMANYREFS: int
-ETIMEDOUT: int
-ECONNREFUSED: int
-EHOSTDOWN: int
-EHOSTUNREACH: int
-EALREADY: int
-EINPROGRESS: int
-ESTALE: int
-EDQUOT: int
-ECANCELED: int  # undocumented
-ENOTRECOVERABLE: int  # undocumented
-EOWNERDEAD: int  # undocumented
+EPERM: Final[int]
+ENOENT: Final[int]
+ESRCH: Final[int]
+EINTR: Final[int]
+EIO: Final[int]
+ENXIO: Final[int]
+E2BIG: Final[int]
+ENOEXEC: Final[int]
+EBADF: Final[int]
+ECHILD: Final[int]
+EAGAIN: Final[int]
+ENOMEM: Final[int]
+EACCES: Final[int]
+EFAULT: Final[int]
+EBUSY: Final[int]
+EEXIST: Final[int]
+EXDEV: Final[int]
+ENODEV: Final[int]
+ENOTDIR: Final[int]
+EISDIR: Final[int]
+EINVAL: Final[int]
+ENFILE: Final[int]
+EMFILE: Final[int]
+ENOTTY: Final[int]
+ETXTBSY: Final[int]
+EFBIG: Final[int]
+ENOSPC: Final[int]
+ESPIPE: Final[int]
+EROFS: Final[int]
+EMLINK: Final[int]
+EPIPE: Final[int]
+EDOM: Final[int]
+ERANGE: Final[int]
+EDEADLK: Final[int]
+ENAMETOOLONG: Final[int]
+ENOLCK: Final[int]
+ENOSYS: Final[int]
+ENOTEMPTY: Final[int]
+ELOOP: Final[int]
+EWOULDBLOCK: Final[int]
+ENOMSG: Final[int]
+EIDRM: Final[int]
+ENOSTR: Final[int]
+ENODATA: Final[int]
+ETIME: Final[int]
+ENOSR: Final[int]
+EREMOTE: Final[int]
+ENOLINK: Final[int]
+EPROTO: Final[int]
+EBADMSG: Final[int]
+EOVERFLOW: Final[int]
+EILSEQ: Final[int]
+EUSERS: Final[int]
+ENOTSOCK: Final[int]
+EDESTADDRREQ: Final[int]
+EMSGSIZE: Final[int]
+EPROTOTYPE: Final[int]
+ENOPROTOOPT: Final[int]
+EPROTONOSUPPORT: Final[int]
+ESOCKTNOSUPPORT: Final[int]
+ENOTSUP: Final[int]
+EOPNOTSUPP: Final[int]
+EPFNOSUPPORT: Final[int]
+EAFNOSUPPORT: Final[int]
+EADDRINUSE: Final[int]
+EADDRNOTAVAIL: Final[int]
+ENETDOWN: Final[int]
+ENETUNREACH: Final[int]
+ENETRESET: Final[int]
+ECONNABORTED: Final[int]
+ECONNRESET: Final[int]
+ENOBUFS: Final[int]
+EISCONN: Final[int]
+ENOTCONN: Final[int]
+ESHUTDOWN: Final[int]
+ETOOMANYREFS: Final[int]
+ETIMEDOUT: Final[int]
+ECONNREFUSED: Final[int]
+EHOSTDOWN: Final[int]
+EHOSTUNREACH: Final[int]
+EALREADY: Final[int]
+EINPROGRESS: Final[int]
+ESTALE: Final[int]
+EDQUOT: Final[int]
+ECANCELED: Final[int]  # undocumented
+ENOTRECOVERABLE: Final[int]  # undocumented
+EOWNERDEAD: Final[int]  # undocumented
 
 if sys.platform == "sunos5" or sys.platform == "solaris":  # noqa: Y008
-    ELOCKUNMAPPED: int
-    ENOTACTIVE: int
+    ELOCKUNMAPPED: Final[int]
+    ENOTACTIVE: Final[int]
 
 if sys.platform != "win32":
-    ENOTBLK: int
-    EMULTIHOP: int
+    ENOTBLK: Final[int]
+    EMULTIHOP: Final[int]
 
 if sys.platform == "darwin":
     # All of the below are undocumented
-    EAUTH: int
-    EBADARCH: int
-    EBADEXEC: int
-    EBADMACHO: int
-    EBADRPC: int
-    EDEVERR: int
-    EFTYPE: int
-    ENEEDAUTH: int
-    ENOATTR: int
-    ENOPOLICY: int
-    EPROCLIM: int
-    EPROCUNAVAIL: int
-    EPROGMISMATCH: int
-    EPROGUNAVAIL: int
-    EPWROFF: int
-    ERPCMISMATCH: int
-    ESHLIBVERS: int
+    EAUTH: Final[int]
+    EBADARCH: Final[int]
+    EBADEXEC: Final[int]
+    EBADMACHO: Final[int]
+    EBADRPC: Final[int]
+    EDEVERR: Final[int]
+    EFTYPE: Final[int]
+    ENEEDAUTH: Final[int]
+    ENOATTR: Final[int]
+    ENOPOLICY: Final[int]
+    EPROCLIM: Final[int]
+    EPROCUNAVAIL: Final[int]
+    EPROGMISMATCH: Final[int]
+    EPROGUNAVAIL: Final[int]
+    EPWROFF: Final[int]
+    ERPCMISMATCH: Final[int]
+    ESHLIBVERS: Final[int]
     if sys.version_info >= (3, 11):
-        EQFULL: int
+        EQFULL: Final[int]
 
 if sys.platform != "darwin":
-    EDEADLOCK: int
+    EDEADLOCK: Final[int]
 
 if sys.platform != "win32" and sys.platform != "darwin":
-    ECHRNG: int
-    EL2NSYNC: int
-    EL3HLT: int
-    EL3RST: int
-    ELNRNG: int
-    EUNATCH: int
-    ENOCSI: int
-    EL2HLT: int
-    EBADE: int
-    EBADR: int
-    EXFULL: int
-    ENOANO: int
-    EBADRQC: int
-    EBADSLT: int
-    EBFONT: int
-    ENONET: int
-    ENOPKG: int
-    EADV: int
-    ESRMNT: int
-    ECOMM: int
-    EDOTDOT: int
-    ENOTUNIQ: int
-    EBADFD: int
-    EREMCHG: int
-    ELIBACC: int
-    ELIBBAD: int
-    ELIBSCN: int
-    ELIBMAX: int
-    ELIBEXEC: int
-    ERESTART: int
-    ESTRPIPE: int
-    EUCLEAN: int
-    ENOTNAM: int
-    ENAVAIL: int
-    EISNAM: int
-    EREMOTEIO: int
+    ECHRNG: Final[int]
+    EL2NSYNC: Final[int]
+    EL3HLT: Final[int]
+    EL3RST: Final[int]
+    ELNRNG: Final[int]
+    EUNATCH: Final[int]
+    ENOCSI: Final[int]
+    EL2HLT: Final[int]
+    EBADE: Final[int]
+    EBADR: Final[int]
+    EXFULL: Final[int]
+    ENOANO: Final[int]
+    EBADRQC: Final[int]
+    EBADSLT: Final[int]
+    EBFONT: Final[int]
+    ENONET: Final[int]
+    ENOPKG: Final[int]
+    EADV: Final[int]
+    ESRMNT: Final[int]
+    ECOMM: Final[int]
+    EDOTDOT: Final[int]
+    ENOTUNIQ: Final[int]
+    EBADFD: Final[int]
+    EREMCHG: Final[int]
+    ELIBACC: Final[int]
+    ELIBBAD: Final[int]
+    ELIBSCN: Final[int]
+    ELIBMAX: Final[int]
+    ELIBEXEC: Final[int]
+    ERESTART: Final[int]
+    ESTRPIPE: Final[int]
+    EUCLEAN: Final[int]
+    ENOTNAM: Final[int]
+    ENAVAIL: Final[int]
+    EISNAM: Final[int]
+    EREMOTEIO: Final[int]
     # All of the below are undocumented
-    EKEYEXPIRED: int
-    EKEYREJECTED: int
-    EKEYREVOKED: int
-    EMEDIUMTYPE: int
-    ENOKEY: int
-    ENOMEDIUM: int
-    ERFKILL: int
+    EKEYEXPIRED: Final[int]
+    EKEYREJECTED: Final[int]
+    EKEYREVOKED: Final[int]
+    EMEDIUMTYPE: Final[int]
+    ENOKEY: Final[int]
+    ENOMEDIUM: Final[int]
+    ERFKILL: Final[int]
 
     if sys.version_info >= (3, 14):
-        EHWPOISON: int
+        EHWPOISON: Final[int]
 
 if sys.platform == "win32":
     # All of these are undocumented
-    WSABASEERR: int
-    WSAEACCES: int
-    WSAEADDRINUSE: int
-    WSAEADDRNOTAVAIL: int
-    WSAEAFNOSUPPORT: int
-    WSAEALREADY: int
-    WSAEBADF: int
-    WSAECONNABORTED: int
-    WSAECONNREFUSED: int
-    WSAECONNRESET: int
-    WSAEDESTADDRREQ: int
-    WSAEDISCON: int
-    WSAEDQUOT: int
-    WSAEFAULT: int
-    WSAEHOSTDOWN: int
-    WSAEHOSTUNREACH: int
-    WSAEINPROGRESS: int
-    WSAEINTR: int
-    WSAEINVAL: int
-    WSAEISCONN: int
-    WSAELOOP: int
-    WSAEMFILE: int
-    WSAEMSGSIZE: int
-    WSAENAMETOOLONG: int
-    WSAENETDOWN: int
-    WSAENETRESET: int
-    WSAENETUNREACH: int
-    WSAENOBUFS: int
-    WSAENOPROTOOPT: int
-    WSAENOTCONN: int
-    WSAENOTEMPTY: int
-    WSAENOTSOCK: int
-    WSAEOPNOTSUPP: int
-    WSAEPFNOSUPPORT: int
-    WSAEPROCLIM: int
-    WSAEPROTONOSUPPORT: int
-    WSAEPROTOTYPE: int
-    WSAEREMOTE: int
-    WSAESHUTDOWN: int
-    WSAESOCKTNOSUPPORT: int
-    WSAESTALE: int
-    WSAETIMEDOUT: int
-    WSAETOOMANYREFS: int
-    WSAEUSERS: int
-    WSAEWOULDBLOCK: int
-    WSANOTINITIALISED: int
-    WSASYSNOTREADY: int
-    WSAVERNOTSUPPORTED: int
+    WSABASEERR: Final[int]
+    WSAEACCES: Final[int]
+    WSAEADDRINUSE: Final[int]
+    WSAEADDRNOTAVAIL: Final[int]
+    WSAEAFNOSUPPORT: Final[int]
+    WSAEALREADY: Final[int]
+    WSAEBADF: Final[int]
+    WSAECONNABORTED: Final[int]
+    WSAECONNREFUSED: Final[int]
+    WSAECONNRESET: Final[int]
+    WSAEDESTADDRREQ: Final[int]
+    WSAEDISCON: Final[int]
+    WSAEDQUOT: Final[int]
+    WSAEFAULT: Final[int]
+    WSAEHOSTDOWN: Final[int]
+    WSAEHOSTUNREACH: Final[int]
+    WSAEINPROGRESS: Final[int]
+    WSAEINTR: Final[int]
+    WSAEINVAL: Final[int]
+    WSAEISCONN: Final[int]
+    WSAELOOP: Final[int]
+    WSAEMFILE: Final[int]
+    WSAEMSGSIZE: Final[int]
+    WSAENAMETOOLONG: Final[int]
+    WSAENETDOWN: Final[int]
+    WSAENETRESET: Final[int]
+    WSAENETUNREACH: Final[int]
+    WSAENOBUFS: Final[int]
+    WSAENOPROTOOPT: Final[int]
+    WSAENOTCONN: Final[int]
+    WSAENOTEMPTY: Final[int]
+    WSAENOTSOCK: Final[int]
+    WSAEOPNOTSUPP: Final[int]
+    WSAEPFNOSUPPORT: Final[int]
+    WSAEPROCLIM: Final[int]
+    WSAEPROTONOSUPPORT: Final[int]
+    WSAEPROTOTYPE: Final[int]
+    WSAEREMOTE: Final[int]
+    WSAESHUTDOWN: Final[int]
+    WSAESOCKTNOSUPPORT: Final[int]
+    WSAESTALE: Final[int]
+    WSAETIMEDOUT: Final[int]
+    WSAETOOMANYREFS: Final[int]
+    WSAEUSERS: Final[int]
+    WSAEWOULDBLOCK: Final[int]
+    WSANOTINITIALISED: Final[int]
+    WSASYSNOTREADY: Final[int]
+    WSAVERNOTSUPPORTED: Final[int]
diff --git a/mypy/typeshed/stdlib/filecmp.pyi b/mypy/typeshed/stdlib/filecmp.pyi
index a2a2b235fdad..620cc177a415 100644
--- a/mypy/typeshed/stdlib/filecmp.pyi
+++ b/mypy/typeshed/stdlib/filecmp.pyi
@@ -6,7 +6,7 @@ from typing import Any, AnyStr, Final, Generic, Literal
 
 __all__ = ["clear_cache", "cmp", "dircmp", "cmpfiles", "DEFAULT_IGNORES"]
 
-DEFAULT_IGNORES: list[str]
+DEFAULT_IGNORES: Final[list[str]]
 BUFSIZE: Final = 8192
 
 def cmp(f1: StrOrBytesPath, f2: StrOrBytesPath, shallow: bool | Literal[0, 1] = True) -> bool: ...
diff --git a/mypy/typeshed/stdlib/fractions.pyi b/mypy/typeshed/stdlib/fractions.pyi
index e81fbaf5dad7..ef4066aa65b5 100644
--- a/mypy/typeshed/stdlib/fractions.pyi
+++ b/mypy/typeshed/stdlib/fractions.pyi
@@ -14,6 +14,7 @@ class _ConvertibleToIntegerRatio(Protocol):
     def as_integer_ratio(self) -> tuple[int | Rational, int | Rational]: ...
 
 class Fraction(Rational):
+    __slots__ = ("_numerator", "_denominator")
     @overload
     def __new__(cls, numerator: int | Rational = 0, denominator: int | Rational | None = None) -> Self: ...
     @overload
diff --git a/mypy/typeshed/stdlib/functools.pyi b/mypy/typeshed/stdlib/functools.pyi
index 6e17ba7d35dc..47baf917294d 100644
--- a/mypy/typeshed/stdlib/functools.pyi
+++ b/mypy/typeshed/stdlib/functools.pyi
@@ -4,7 +4,7 @@ from _typeshed import SupportsAllComparisons, SupportsItems
 from collections.abc import Callable, Hashable, Iterable, Sized
 from types import GenericAlias
 from typing import Any, Final, Generic, Literal, NamedTuple, TypedDict, TypeVar, final, overload, type_check_only
-from typing_extensions import ParamSpec, Self, TypeAlias
+from typing_extensions import ParamSpec, Self, TypeAlias, disjoint_base
 
 __all__ = [
     "update_wrapper",
@@ -95,7 +95,7 @@ else:
         tuple[Literal["__module__"], Literal["__name__"], Literal["__qualname__"], Literal["__doc__"], Literal["__annotations__"]]
     ]
 
-WRAPPER_UPDATES: tuple[Literal["__dict__"]]
+WRAPPER_UPDATES: Final[tuple[Literal["__dict__"]]]
 
 @type_check_only
 class _Wrapped(Generic[_PWrapped, _RWrapped, _PWrapper, _RWrapper]):
@@ -150,7 +150,7 @@ else:
 
 def total_ordering(cls: type[_T]) -> type[_T]: ...
 def cmp_to_key(mycmp: Callable[[_T, _T], int]) -> Callable[[_T], SupportsAllComparisons]: ...
-
+@disjoint_base
 class partial(Generic[_T]):
     @property
     def func(self) -> Callable[..., _T]: ...
@@ -169,10 +169,17 @@ class partialmethod(Generic[_T]):
     func: Callable[..., _T] | _Descriptor
     args: tuple[Any, ...]
     keywords: dict[str, Any]
-    @overload
-    def __init__(self, func: Callable[..., _T], /, *args: Any, **keywords: Any) -> None: ...
-    @overload
-    def __init__(self, func: _Descriptor, /, *args: Any, **keywords: Any) -> None: ...
+    if sys.version_info >= (3, 14):
+        @overload
+        def __new__(self, func: Callable[..., _T], /, *args: Any, **keywords: Any) -> Self: ...
+        @overload
+        def __new__(self, func: _Descriptor, /, *args: Any, **keywords: Any) -> Self: ...
+    else:
+        @overload
+        def __init__(self, func: Callable[..., _T], /, *args: Any, **keywords: Any) -> None: ...
+        @overload
+        def __init__(self, func: _Descriptor, /, *args: Any, **keywords: Any) -> None: ...
+
     def __get__(self, obj: Any, cls: type[Any] | None = None) -> Callable[..., _T]: ...
     @property
     def __isabstractmethod__(self) -> bool: ...
diff --git a/mypy/typeshed/stdlib/gettext.pyi b/mypy/typeshed/stdlib/gettext.pyi
index 937aece03437..e9ffd7a4a4a4 100644
--- a/mypy/typeshed/stdlib/gettext.pyi
+++ b/mypy/typeshed/stdlib/gettext.pyi
@@ -120,7 +120,7 @@ else:
         languages: Iterable[str] | None = None,
         class_: None = None,
         fallback: Literal[False] = False,
-        codeset: str | None = None,
+        codeset: str | None = ...,
     ) -> GNUTranslations: ...
     @overload
     def translation(
@@ -130,7 +130,7 @@ else:
         *,
         class_: Callable[[io.BufferedReader], _NullTranslationsT],
         fallback: Literal[False] = False,
-        codeset: str | None = None,
+        codeset: str | None = ...,
     ) -> _NullTranslationsT: ...
     @overload
     def translation(
@@ -139,7 +139,7 @@ else:
         languages: Iterable[str] | None,
         class_: Callable[[io.BufferedReader], _NullTranslationsT],
         fallback: Literal[False] = False,
-        codeset: str | None = None,
+        codeset: str | None = ...,
     ) -> _NullTranslationsT: ...
     @overload
     def translation(
@@ -148,18 +148,18 @@ else:
         languages: Iterable[str] | None = None,
         class_: Callable[[io.BufferedReader], NullTranslations] | None = None,
         fallback: bool = False,
-        codeset: str | None = None,
+        codeset: str | None = ...,
     ) -> NullTranslations: ...
     @overload
-    def install(
-        domain: str, localedir: StrPath | None = None, codeset: None = None, names: Container[str] | None = None
-    ) -> None: ...
+    def install(domain: str, localedir: StrPath | None = None, names: Container[str] | None = None) -> None: ...
     @overload
     @deprecated("The `codeset` parameter is deprecated since Python 3.8; removed in Python 3.11.")
-    def install(domain: str, localedir: StrPath | None, codeset: str, /, names: Container[str] | None = None) -> None: ...
+    def install(domain: str, localedir: StrPath | None, codeset: str | None, /, names: Container[str] | None = None) -> None: ...
     @overload
     @deprecated("The `codeset` parameter is deprecated since Python 3.8; removed in Python 3.11.")
-    def install(domain: str, localedir: StrPath | None = None, *, codeset: str, names: Container[str] | None = None) -> None: ...
+    def install(
+        domain: str, localedir: StrPath | None = None, *, codeset: str | None, names: Container[str] | None = None
+    ) -> None: ...
 
 def textdomain(domain: str | None = None) -> str: ...
 def bindtextdomain(domain: str, localedir: StrPath | None = None) -> str: ...
diff --git a/mypy/typeshed/stdlib/glob.pyi b/mypy/typeshed/stdlib/glob.pyi
index 63069d8009c8..942fd7396196 100644
--- a/mypy/typeshed/stdlib/glob.pyi
+++ b/mypy/typeshed/stdlib/glob.pyi
@@ -10,9 +10,13 @@ if sys.version_info >= (3, 13):
     __all__ += ["translate"]
 
 if sys.version_info >= (3, 10):
-    @deprecated("Will be removed in Python 3.15; Use `glob.glob` and pass *root_dir* argument instead.")
+    @deprecated(
+        "Deprecated since Python 3.10; will be removed in Python 3.15. Use `glob.glob()` with the *root_dir* argument instead."
+    )
     def glob0(dirname: AnyStr, pattern: AnyStr) -> list[AnyStr]: ...
-    @deprecated("Will be removed in Python 3.15; Use `glob.glob` and pass *root_dir* argument instead.")
+    @deprecated(
+        "Deprecated since Python 3.10; will be removed in Python 3.15. Use `glob.glob()` with the *root_dir* argument instead."
+    )
     def glob1(dirname: AnyStr, pattern: AnyStr) -> list[AnyStr]: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/hmac.pyi b/mypy/typeshed/stdlib/hmac.pyi
index 300ed9eb26d8..070c59b1c166 100644
--- a/mypy/typeshed/stdlib/hmac.pyi
+++ b/mypy/typeshed/stdlib/hmac.pyi
@@ -20,6 +20,7 @@ def new(key: bytes | bytearray, msg: ReadableBuffer | None, digestmod: _DigestMo
 def new(key: bytes | bytearray, *, digestmod: _DigestMod) -> HMAC: ...
 
 class HMAC:
+    __slots__ = ("_hmac", "_inner", "_outer", "block_size", "digest_size")
     digest_size: int
     block_size: int
     @property
diff --git a/mypy/typeshed/stdlib/html/entities.pyi b/mypy/typeshed/stdlib/html/entities.pyi
index be83fd1135be..e5890d1ecfbd 100644
--- a/mypy/typeshed/stdlib/html/entities.pyi
+++ b/mypy/typeshed/stdlib/html/entities.pyi
@@ -1,6 +1,8 @@
+from typing import Final
+
 __all__ = ["html5", "name2codepoint", "codepoint2name", "entitydefs"]
 
-name2codepoint: dict[str, int]
-html5: dict[str, str]
-codepoint2name: dict[int, str]
-entitydefs: dict[str, str]
+name2codepoint: Final[dict[str, int]]
+html5: Final[dict[str, str]]
+codepoint2name: Final[dict[int, str]]
+entitydefs: Final[dict[str, str]]
diff --git a/mypy/typeshed/stdlib/http/client.pyi b/mypy/typeshed/stdlib/http/client.pyi
index 5c35dff28d43..d259e84e6f2a 100644
--- a/mypy/typeshed/stdlib/http/client.pyi
+++ b/mypy/typeshed/stdlib/http/client.pyi
@@ -7,7 +7,7 @@ from _typeshed import MaybeNone, ReadableBuffer, SupportsRead, SupportsReadline,
 from collections.abc import Callable, Iterable, Iterator, Mapping
 from email._policybase import _MessageT
 from socket import socket
-from typing import BinaryIO, Literal, TypeVar, overload
+from typing import BinaryIO, Final, TypeVar, overload
 from typing_extensions import Self, TypeAlias
 
 __all__ = [
@@ -36,85 +36,85 @@ _DataType: TypeAlias = SupportsRead[bytes] | Iterable[ReadableBuffer] | Readable
 _T = TypeVar("_T")
 _HeaderValue: TypeAlias = ReadableBuffer | str | int
 
-HTTP_PORT: int
-HTTPS_PORT: int
+HTTP_PORT: Final = 80
+HTTPS_PORT: Final = 443
 
 # Keep these global constants in sync with http.HTTPStatus (http/__init__.pyi).
 # They are present for backward compatibility reasons.
-CONTINUE: Literal[100]
-SWITCHING_PROTOCOLS: Literal[101]
-PROCESSING: Literal[102]
-EARLY_HINTS: Literal[103]
+CONTINUE: Final = 100
+SWITCHING_PROTOCOLS: Final = 101
+PROCESSING: Final = 102
+EARLY_HINTS: Final = 103
 
-OK: Literal[200]
-CREATED: Literal[201]
-ACCEPTED: Literal[202]
-NON_AUTHORITATIVE_INFORMATION: Literal[203]
-NO_CONTENT: Literal[204]
-RESET_CONTENT: Literal[205]
-PARTIAL_CONTENT: Literal[206]
-MULTI_STATUS: Literal[207]
-ALREADY_REPORTED: Literal[208]
-IM_USED: Literal[226]
+OK: Final = 200
+CREATED: Final = 201
+ACCEPTED: Final = 202
+NON_AUTHORITATIVE_INFORMATION: Final = 203
+NO_CONTENT: Final = 204
+RESET_CONTENT: Final = 205
+PARTIAL_CONTENT: Final = 206
+MULTI_STATUS: Final = 207
+ALREADY_REPORTED: Final = 208
+IM_USED: Final = 226
 
-MULTIPLE_CHOICES: Literal[300]
-MOVED_PERMANENTLY: Literal[301]
-FOUND: Literal[302]
-SEE_OTHER: Literal[303]
-NOT_MODIFIED: Literal[304]
-USE_PROXY: Literal[305]
-TEMPORARY_REDIRECT: Literal[307]
-PERMANENT_REDIRECT: Literal[308]
+MULTIPLE_CHOICES: Final = 300
+MOVED_PERMANENTLY: Final = 301
+FOUND: Final = 302
+SEE_OTHER: Final = 303
+NOT_MODIFIED: Final = 304
+USE_PROXY: Final = 305
+TEMPORARY_REDIRECT: Final = 307
+PERMANENT_REDIRECT: Final = 308
 
-BAD_REQUEST: Literal[400]
-UNAUTHORIZED: Literal[401]
-PAYMENT_REQUIRED: Literal[402]
-FORBIDDEN: Literal[403]
-NOT_FOUND: Literal[404]
-METHOD_NOT_ALLOWED: Literal[405]
-NOT_ACCEPTABLE: Literal[406]
-PROXY_AUTHENTICATION_REQUIRED: Literal[407]
-REQUEST_TIMEOUT: Literal[408]
-CONFLICT: Literal[409]
-GONE: Literal[410]
-LENGTH_REQUIRED: Literal[411]
-PRECONDITION_FAILED: Literal[412]
+BAD_REQUEST: Final = 400
+UNAUTHORIZED: Final = 401
+PAYMENT_REQUIRED: Final = 402
+FORBIDDEN: Final = 403
+NOT_FOUND: Final = 404
+METHOD_NOT_ALLOWED: Final = 405
+NOT_ACCEPTABLE: Final = 406
+PROXY_AUTHENTICATION_REQUIRED: Final = 407
+REQUEST_TIMEOUT: Final = 408
+CONFLICT: Final = 409
+GONE: Final = 410
+LENGTH_REQUIRED: Final = 411
+PRECONDITION_FAILED: Final = 412
 if sys.version_info >= (3, 13):
-    CONTENT_TOO_LARGE: Literal[413]
-REQUEST_ENTITY_TOO_LARGE: Literal[413]
+    CONTENT_TOO_LARGE: Final = 413
+REQUEST_ENTITY_TOO_LARGE: Final = 413
 if sys.version_info >= (3, 13):
-    URI_TOO_LONG: Literal[414]
-REQUEST_URI_TOO_LONG: Literal[414]
-UNSUPPORTED_MEDIA_TYPE: Literal[415]
+    URI_TOO_LONG: Final = 414
+REQUEST_URI_TOO_LONG: Final = 414
+UNSUPPORTED_MEDIA_TYPE: Final = 415
 if sys.version_info >= (3, 13):
-    RANGE_NOT_SATISFIABLE: Literal[416]
-REQUESTED_RANGE_NOT_SATISFIABLE: Literal[416]
-EXPECTATION_FAILED: Literal[417]
-IM_A_TEAPOT: Literal[418]
-MISDIRECTED_REQUEST: Literal[421]
+    RANGE_NOT_SATISFIABLE: Final = 416
+REQUESTED_RANGE_NOT_SATISFIABLE: Final = 416
+EXPECTATION_FAILED: Final = 417
+IM_A_TEAPOT: Final = 418
+MISDIRECTED_REQUEST: Final = 421
 if sys.version_info >= (3, 13):
-    UNPROCESSABLE_CONTENT: Literal[422]
-UNPROCESSABLE_ENTITY: Literal[422]
-LOCKED: Literal[423]
-FAILED_DEPENDENCY: Literal[424]
-TOO_EARLY: Literal[425]
-UPGRADE_REQUIRED: Literal[426]
-PRECONDITION_REQUIRED: Literal[428]
-TOO_MANY_REQUESTS: Literal[429]
-REQUEST_HEADER_FIELDS_TOO_LARGE: Literal[431]
-UNAVAILABLE_FOR_LEGAL_REASONS: Literal[451]
+    UNPROCESSABLE_CONTENT: Final = 422
+UNPROCESSABLE_ENTITY: Final = 422
+LOCKED: Final = 423
+FAILED_DEPENDENCY: Final = 424
+TOO_EARLY: Final = 425
+UPGRADE_REQUIRED: Final = 426
+PRECONDITION_REQUIRED: Final = 428
+TOO_MANY_REQUESTS: Final = 429
+REQUEST_HEADER_FIELDS_TOO_LARGE: Final = 431
+UNAVAILABLE_FOR_LEGAL_REASONS: Final = 451
 
-INTERNAL_SERVER_ERROR: Literal[500]
-NOT_IMPLEMENTED: Literal[501]
-BAD_GATEWAY: Literal[502]
-SERVICE_UNAVAILABLE: Literal[503]
-GATEWAY_TIMEOUT: Literal[504]
-HTTP_VERSION_NOT_SUPPORTED: Literal[505]
-VARIANT_ALSO_NEGOTIATES: Literal[506]
-INSUFFICIENT_STORAGE: Literal[507]
-LOOP_DETECTED: Literal[508]
-NOT_EXTENDED: Literal[510]
-NETWORK_AUTHENTICATION_REQUIRED: Literal[511]
+INTERNAL_SERVER_ERROR: Final = 500
+NOT_IMPLEMENTED: Final = 501
+BAD_GATEWAY: Final = 502
+SERVICE_UNAVAILABLE: Final = 503
+GATEWAY_TIMEOUT: Final = 504
+HTTP_VERSION_NOT_SUPPORTED: Final = 505
+VARIANT_ALSO_NEGOTIATES: Final = 506
+INSUFFICIENT_STORAGE: Final = 507
+LOOP_DETECTED: Final = 508
+NOT_EXTENDED: Final = 510
+NETWORK_AUTHENTICATION_REQUIRED: Final = 511
 
 responses: dict[int, str]
 
diff --git a/mypy/typeshed/stdlib/http/server.pyi b/mypy/typeshed/stdlib/http/server.pyi
index 429bb65bb0ef..2c1a374331bc 100644
--- a/mypy/typeshed/stdlib/http/server.pyi
+++ b/mypy/typeshed/stdlib/http/server.pyi
@@ -119,12 +119,24 @@ class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
     def guess_type(self, path: StrPath) -> str: ...  # undocumented
 
 def executable(path: StrPath) -> bool: ...  # undocumented
-@deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-class CGIHTTPRequestHandler(SimpleHTTPRequestHandler):
-    cgi_directories: list[str]
-    have_fork: bool  # undocumented
-    def do_POST(self) -> None: ...
-    def is_cgi(self) -> bool: ...  # undocumented
-    def is_executable(self, path: StrPath) -> bool: ...  # undocumented
-    def is_python(self, path: StrPath) -> bool: ...  # undocumented
-    def run_cgi(self) -> None: ...  # undocumented
+
+if sys.version_info >= (3, 13):
+    @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+    class CGIHTTPRequestHandler(SimpleHTTPRequestHandler):
+        cgi_directories: list[str]
+        have_fork: bool  # undocumented
+        def do_POST(self) -> None: ...
+        def is_cgi(self) -> bool: ...  # undocumented
+        def is_executable(self, path: StrPath) -> bool: ...  # undocumented
+        def is_python(self, path: StrPath) -> bool: ...  # undocumented
+        def run_cgi(self) -> None: ...  # undocumented
+
+else:
+    class CGIHTTPRequestHandler(SimpleHTTPRequestHandler):
+        cgi_directories: list[str]
+        have_fork: bool  # undocumented
+        def do_POST(self) -> None: ...
+        def is_cgi(self) -> bool: ...  # undocumented
+        def is_executable(self, path: StrPath) -> bool: ...  # undocumented
+        def is_python(self, path: StrPath) -> bool: ...  # undocumented
+        def run_cgi(self) -> None: ...  # undocumented
diff --git a/mypy/typeshed/stdlib/imp.pyi b/mypy/typeshed/stdlib/imp.pyi
index f045fd969b27..b5b4223aa58e 100644
--- a/mypy/typeshed/stdlib/imp.pyi
+++ b/mypy/typeshed/stdlib/imp.pyi
@@ -13,18 +13,18 @@ from _imp import (
 from _typeshed import StrPath
 from os import PathLike
 from types import TracebackType
-from typing import IO, Any, Protocol, type_check_only
+from typing import IO, Any, Final, Protocol, type_check_only
 
-SEARCH_ERROR: int
-PY_SOURCE: int
-PY_COMPILED: int
-C_EXTENSION: int
-PY_RESOURCE: int
-PKG_DIRECTORY: int
-C_BUILTIN: int
-PY_FROZEN: int
-PY_CODERESOURCE: int
-IMP_HOOK: int
+SEARCH_ERROR: Final = 0
+PY_SOURCE: Final = 1
+PY_COMPILED: Final = 2
+C_EXTENSION: Final = 3
+PY_RESOURCE: Final = 4
+PKG_DIRECTORY: Final = 5
+C_BUILTIN: Final = 6
+PY_FROZEN: Final = 7
+PY_CODERESOURCE: Final = 8
+IMP_HOOK: Final = 9
 
 def new_module(name: str) -> types.ModuleType: ...
 def get_magic() -> bytes: ...
diff --git a/mypy/typeshed/stdlib/importlib/abc.pyi b/mypy/typeshed/stdlib/importlib/abc.pyi
index ef87663cb72d..72031e0e3bd2 100644
--- a/mypy/typeshed/stdlib/importlib/abc.pyi
+++ b/mypy/typeshed/stdlib/importlib/abc.pyi
@@ -40,7 +40,7 @@ if sys.version_info < (3, 12):
     @deprecated("Deprecated since Python 3.3; removed in Python 3.12. Use `MetaPathFinder` or `PathEntryFinder` instead.")
     class Finder(metaclass=ABCMeta): ...
 
-@deprecated("Deprecated as of Python 3.7: Use importlib.resources.abc.TraversableResources instead.")
+@deprecated("Deprecated since Python 3.7. Use `importlib.resources.abc.TraversableResources` instead.")
 class ResourceLoader(Loader):
     @abstractmethod
     def get_data(self, path: str) -> bytes: ...
@@ -61,7 +61,7 @@ class ExecutionLoader(InspectLoader):
     def get_filename(self, fullname: str) -> str: ...
 
 class SourceLoader(_bootstrap_external.SourceLoader, ResourceLoader, ExecutionLoader, metaclass=ABCMeta):  # type: ignore[misc]  # incompatible definitions of source_to_code in the base classes
-    @deprecated("Deprecated as of Python 3.3: Use importlib.resources.abc.SourceLoader.path_stats instead.")
+    @deprecated("Deprecated since Python 3.3. Use `importlib.resources.abc.SourceLoader.path_stats` instead.")
     def path_mtime(self, path: str) -> float: ...
     def set_data(self, path: str, data: bytes) -> None: ...
     def get_source(self, fullname: str) -> str | None: ...
diff --git a/mypy/typeshed/stdlib/importlib/metadata/__init__.pyi b/mypy/typeshed/stdlib/importlib/metadata/__init__.pyi
index d1315b2eb2f1..9286e92331c8 100644
--- a/mypy/typeshed/stdlib/importlib/metadata/__init__.pyi
+++ b/mypy/typeshed/stdlib/importlib/metadata/__init__.pyi
@@ -11,7 +11,7 @@ from os import PathLike
 from pathlib import Path
 from re import Pattern
 from typing import Any, ClassVar, Generic, NamedTuple, TypeVar, overload
-from typing_extensions import Self, TypeAlias, deprecated
+from typing_extensions import Self, TypeAlias, deprecated, disjoint_base
 
 _T = TypeVar("_T")
 _KT = TypeVar("_KT")
@@ -59,23 +59,21 @@ else:
         value: str
         group: str
 
-class EntryPoint(_EntryPointBase):
-    pattern: ClassVar[Pattern[str]]
-    if sys.version_info >= (3, 11):
+if sys.version_info >= (3, 11):
+    class EntryPoint(_EntryPointBase):
+        pattern: ClassVar[Pattern[str]]
         name: str
         value: str
         group: str
 
         def __init__(self, name: str, value: str, group: str) -> None: ...
-
-    def load(self) -> Any: ...  # Callable[[], Any] or an importable module
-    @property
-    def extras(self) -> list[str]: ...
-    @property
-    def module(self) -> str: ...
-    @property
-    def attr(self) -> str: ...
-    if sys.version_info >= (3, 10):
+        def load(self) -> Any: ...  # Callable[[], Any] or an importable module
+        @property
+        def extras(self) -> list[str]: ...
+        @property
+        def module(self) -> str: ...
+        @property
+        def attr(self) -> str: ...
         dist: ClassVar[Distribution | None]
         def matches(
             self,
@@ -87,16 +85,43 @@ class EntryPoint(_EntryPointBase):
             attr: str = ...,
             extras: list[str] = ...,
         ) -> bool: ...  # undocumented
-
-    def __hash__(self) -> int: ...
-    if sys.version_info >= (3, 11):
+        def __hash__(self) -> int: ...
         def __eq__(self, other: object) -> bool: ...
         def __lt__(self, other: object) -> bool: ...
-    if sys.version_info < (3, 12):
+        if sys.version_info < (3, 12):
+            def __iter__(self) -> Iterator[Any]: ...  # result of iter((str, Self)), really
+
+else:
+    @disjoint_base
+    class EntryPoint(_EntryPointBase):
+        pattern: ClassVar[Pattern[str]]
+
+        def load(self) -> Any: ...  # Callable[[], Any] or an importable module
+        @property
+        def extras(self) -> list[str]: ...
+        @property
+        def module(self) -> str: ...
+        @property
+        def attr(self) -> str: ...
+        if sys.version_info >= (3, 10):
+            dist: ClassVar[Distribution | None]
+            def matches(
+                self,
+                *,
+                name: str = ...,
+                value: str = ...,
+                group: str = ...,
+                module: str = ...,
+                attr: str = ...,
+                extras: list[str] = ...,
+            ) -> bool: ...  # undocumented
+
+        def __hash__(self) -> int: ...
         def __iter__(self) -> Iterator[Any]: ...  # result of iter((str, Self)), really
 
 if sys.version_info >= (3, 12):
     class EntryPoints(tuple[EntryPoint, ...]):
+        __slots__ = ()
         def __getitem__(self, name: str) -> EntryPoint: ...  # type: ignore[override]
         def select(
             self,
@@ -114,10 +139,12 @@ if sys.version_info >= (3, 12):
         def groups(self) -> set[str]: ...
 
 elif sys.version_info >= (3, 10):
-    class DeprecatedList(list[_T]): ...
+    class DeprecatedList(list[_T]):
+        __slots__ = ()
 
     class EntryPoints(DeprecatedList[EntryPoint]):  # use as list is deprecated since 3.10
         # int argument is deprecated since 3.10
+        __slots__ = ()
         def __getitem__(self, name: int | str) -> EntryPoint: ...  # type: ignore[override]
         def select(
             self,
@@ -230,7 +257,7 @@ class Distribution(_distribution_parent):
         def name(self) -> str: ...
     if sys.version_info >= (3, 13):
         @property
-        def origin(self) -> types.SimpleNamespace: ...
+        def origin(self) -> types.SimpleNamespace | None: ...
 
 class DistributionFinder(MetaPathFinder):
     class Context:
diff --git a/mypy/typeshed/stdlib/inspect.pyi b/mypy/typeshed/stdlib/inspect.pyi
index f8ec6cad0160..55ae61617af7 100644
--- a/mypy/typeshed/stdlib/inspect.pyi
+++ b/mypy/typeshed/stdlib/inspect.pyi
@@ -26,7 +26,7 @@ from types import (
     WrapperDescriptorType,
 )
 from typing import Any, ClassVar, Final, Literal, NamedTuple, Protocol, TypeVar, overload, type_check_only
-from typing_extensions import ParamSpec, Self, TypeAlias, TypeGuard, TypeIs, deprecated
+from typing_extensions import ParamSpec, Self, TypeAlias, TypeGuard, TypeIs, deprecated, disjoint_base
 
 if sys.version_info >= (3, 14):
     from annotationlib import Format
@@ -336,6 +336,7 @@ class _void: ...
 class _empty: ...
 
 class Signature:
+    __slots__ = ("_return_annotation", "_parameters")
     def __init__(
         self, parameters: Sequence[Parameter] | None = None, *, return_annotation: Any = ..., __validate_parameters__: bool = True
     ) -> None: ...
@@ -416,6 +417,7 @@ if sys.version_info >= (3, 12):
     def getasyncgenlocals(agen: AsyncGeneratorType[Any, Any]) -> dict[str, Any]: ...
 
 class Parameter:
+    __slots__ = ("_name", "_kind", "_default", "_annotation")
     def __init__(self, name: str, kind: _ParameterKind, *, default: Any = ..., annotation: Any = ...) -> None: ...
     empty = _empty
 
@@ -447,6 +449,7 @@ class Parameter:
     def __hash__(self) -> int: ...
 
 class BoundArguments:
+    __slots__ = ("arguments", "_signature", "__weakref__")
     arguments: OrderedDict[str, Any]
     @property
     def args(self) -> tuple[Any, ...]: ...
@@ -567,19 +570,6 @@ if sys.version_info >= (3, 11):
         code_context: list[str] | None
         index: int | None  # type: ignore[assignment]
 
-    class Traceback(_Traceback):
-        positions: dis.Positions | None
-        def __new__(
-            cls,
-            filename: str,
-            lineno: int,
-            function: str,
-            code_context: list[str] | None,
-            index: int | None,
-            *,
-            positions: dis.Positions | None = None,
-        ) -> Self: ...
-
     class _FrameInfo(NamedTuple):
         frame: FrameType
         filename: str
@@ -588,19 +578,63 @@ if sys.version_info >= (3, 11):
         code_context: list[str] | None
         index: int | None  # type: ignore[assignment]
 
-    class FrameInfo(_FrameInfo):
-        positions: dis.Positions | None
-        def __new__(
-            cls,
-            frame: FrameType,
-            filename: str,
-            lineno: int,
-            function: str,
-            code_context: list[str] | None,
-            index: int | None,
-            *,
-            positions: dis.Positions | None = None,
-        ) -> Self: ...
+    if sys.version_info >= (3, 12):
+        class Traceback(_Traceback):
+            positions: dis.Positions | None
+            def __new__(
+                cls,
+                filename: str,
+                lineno: int,
+                function: str,
+                code_context: list[str] | None,
+                index: int | None,
+                *,
+                positions: dis.Positions | None = None,
+            ) -> Self: ...
+
+        class FrameInfo(_FrameInfo):
+            positions: dis.Positions | None
+            def __new__(
+                cls,
+                frame: FrameType,
+                filename: str,
+                lineno: int,
+                function: str,
+                code_context: list[str] | None,
+                index: int | None,
+                *,
+                positions: dis.Positions | None = None,
+            ) -> Self: ...
+
+    else:
+        @disjoint_base
+        class Traceback(_Traceback):
+            positions: dis.Positions | None
+            def __new__(
+                cls,
+                filename: str,
+                lineno: int,
+                function: str,
+                code_context: list[str] | None,
+                index: int | None,
+                *,
+                positions: dis.Positions | None = None,
+            ) -> Self: ...
+
+        @disjoint_base
+        class FrameInfo(_FrameInfo):
+            positions: dis.Positions | None
+            def __new__(
+                cls,
+                frame: FrameType,
+                filename: str,
+                lineno: int,
+                function: str,
+                code_context: list[str] | None,
+                index: int | None,
+                *,
+                positions: dis.Positions | None = None,
+            ) -> Self: ...
 
 else:
     class Traceback(NamedTuple):
diff --git a/mypy/typeshed/stdlib/io.pyi b/mypy/typeshed/stdlib/io.pyi
index 1313df183d36..d301d700e9d0 100644
--- a/mypy/typeshed/stdlib/io.pyi
+++ b/mypy/typeshed/stdlib/io.pyi
@@ -67,7 +67,9 @@ class TextIOBase(_TextIOBase, IOBase): ...
 
 if sys.version_info >= (3, 14):
     class Reader(Protocol[_T_co]):
+        __slots__ = ()
         def read(self, size: int = ..., /) -> _T_co: ...
 
     class Writer(Protocol[_T_contra]):
+        __slots__ = ()
         def write(self, data: _T_contra, /) -> int: ...
diff --git a/mypy/typeshed/stdlib/ipaddress.pyi b/mypy/typeshed/stdlib/ipaddress.pyi
index 6d49eb8bd94a..e2f3defa2dea 100644
--- a/mypy/typeshed/stdlib/ipaddress.pyi
+++ b/mypy/typeshed/stdlib/ipaddress.pyi
@@ -22,6 +22,7 @@ def ip_interface(
 ) -> IPv4Interface | IPv6Interface: ...
 
 class _IPAddressBase:
+    __slots__ = ()
     @property
     def compressed(self) -> str: ...
     @property
@@ -33,6 +34,7 @@ class _IPAddressBase:
         def version(self) -> int: ...
 
 class _BaseAddress(_IPAddressBase):
+    __slots__ = ()
     def __add__(self, other: int) -> Self: ...
     def __hash__(self) -> int: ...
     def __int__(self) -> int: ...
@@ -71,7 +73,7 @@ class _BaseNetwork(_IPAddressBase, Generic[_A]):
     @property
     def broadcast_address(self) -> _A: ...
     def compare_networks(self, other: Self) -> int: ...
-    def hosts(self) -> Iterator[_A]: ...
+    def hosts(self) -> Iterator[_A] | list[_A]: ...
     @property
     def is_global(self) -> bool: ...
     @property
@@ -105,6 +107,7 @@ class _BaseNetwork(_IPAddressBase, Generic[_A]):
     def hostmask(self) -> _A: ...
 
 class _BaseV4:
+    __slots__ = ()
     if sys.version_info >= (3, 14):
         version: Final = 4
         max_prefixlen: Final = 32
@@ -115,6 +118,7 @@ class _BaseV4:
         def max_prefixlen(self) -> Literal[32]: ...
 
 class IPv4Address(_BaseV4, _BaseAddress):
+    __slots__ = ("_ip", "__weakref__")
     def __init__(self, address: object) -> None: ...
     @property
     def is_global(self) -> bool: ...
@@ -156,6 +160,7 @@ class IPv4Interface(IPv4Address):
     def with_prefixlen(self) -> str: ...
 
 class _BaseV6:
+    __slots__ = ()
     if sys.version_info >= (3, 14):
         version: Final = 6
         max_prefixlen: Final = 128
@@ -166,6 +171,7 @@ class _BaseV6:
         def max_prefixlen(self) -> Literal[128]: ...
 
 class IPv6Address(_BaseV6, _BaseAddress):
+    __slots__ = ("_ip", "_scope_id", "__weakref__")
     def __init__(self, address: object) -> None: ...
     @property
     def is_global(self) -> bool: ...
diff --git a/mypy/typeshed/stdlib/itertools.pyi b/mypy/typeshed/stdlib/itertools.pyi
index 7d05b1318680..73745fe92d9e 100644
--- a/mypy/typeshed/stdlib/itertools.pyi
+++ b/mypy/typeshed/stdlib/itertools.pyi
@@ -3,7 +3,7 @@ from _typeshed import MaybeNone
 from collections.abc import Callable, Iterable, Iterator
 from types import GenericAlias
 from typing import Any, Generic, Literal, SupportsComplex, SupportsFloat, SupportsIndex, SupportsInt, TypeVar, overload
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 _T = TypeVar("_T")
 _S = TypeVar("_S")
@@ -27,6 +27,7 @@ _Predicate: TypeAlias = Callable[[_T], object]
 
 # Technically count can take anything that implements a number protocol and has an add method
 # but we can't enforce the add method
+@disjoint_base
 class count(Iterator[_N]):
     @overload
     def __new__(cls) -> count[int]: ...
@@ -37,11 +38,13 @@ class count(Iterator[_N]):
     def __next__(self) -> _N: ...
     def __iter__(self) -> Self: ...
 
+@disjoint_base
 class cycle(Iterator[_T]):
     def __new__(cls, iterable: Iterable[_T], /) -> Self: ...
     def __next__(self) -> _T: ...
     def __iter__(self) -> Self: ...
 
+@disjoint_base
 class repeat(Iterator[_T]):
     @overload
     def __new__(cls, object: _T) -> Self: ...
@@ -51,6 +54,7 @@ class repeat(Iterator[_T]):
     def __iter__(self) -> Self: ...
     def __length_hint__(self) -> int: ...
 
+@disjoint_base
 class accumulate(Iterator[_T]):
     @overload
     def __new__(cls, iterable: Iterable[_T], func: None = None, *, initial: _T | None = ...) -> Self: ...
@@ -59,6 +63,7 @@ class accumulate(Iterator[_T]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
+@disjoint_base
 class chain(Iterator[_T]):
     def __new__(cls, *iterables: Iterable[_T]) -> Self: ...
     def __next__(self) -> _T: ...
@@ -68,21 +73,25 @@ class chain(Iterator[_T]):
     def from_iterable(cls: type[Any], iterable: Iterable[Iterable[_S]], /) -> chain[_S]: ...
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
+@disjoint_base
 class compress(Iterator[_T]):
     def __new__(cls, data: Iterable[_T], selectors: Iterable[Any]) -> Self: ...
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
+@disjoint_base
 class dropwhile(Iterator[_T]):
     def __new__(cls, predicate: _Predicate[_T], iterable: Iterable[_T], /) -> Self: ...
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
+@disjoint_base
 class filterfalse(Iterator[_T]):
     def __new__(cls, function: _Predicate[_T] | None, iterable: Iterable[_T], /) -> Self: ...
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
+@disjoint_base
 class groupby(Iterator[tuple[_T_co, Iterator[_S_co]]], Generic[_T_co, _S_co]):
     @overload
     def __new__(cls, iterable: Iterable[_T1], key: None = None) -> groupby[_T1, _T1]: ...
@@ -91,6 +100,7 @@ class groupby(Iterator[tuple[_T_co, Iterator[_S_co]]], Generic[_T_co, _S_co]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> tuple[_T_co, Iterator[_S_co]]: ...
 
+@disjoint_base
 class islice(Iterator[_T]):
     @overload
     def __new__(cls, iterable: Iterable[_T], stop: int | None, /) -> Self: ...
@@ -99,18 +109,20 @@ class islice(Iterator[_T]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
+@disjoint_base
 class starmap(Iterator[_T_co]):
     def __new__(cls, function: Callable[..., _T], iterable: Iterable[Iterable[Any]], /) -> starmap[_T]: ...
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
+@disjoint_base
 class takewhile(Iterator[_T]):
     def __new__(cls, predicate: _Predicate[_T], iterable: Iterable[_T], /) -> Self: ...
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T: ...
 
 def tee(iterable: Iterable[_T], n: int = 2, /) -> tuple[Iterator[_T], ...]: ...
-
+@disjoint_base
 class zip_longest(Iterator[_T_co]):
     # one iterable (fillvalue doesn't matter)
     @overload
@@ -189,6 +201,7 @@ class zip_longest(Iterator[_T_co]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
+@disjoint_base
 class product(Iterator[_T_co]):
     @overload
     def __new__(cls, iter1: Iterable[_T1], /) -> product[tuple[_T1]]: ...
@@ -274,6 +287,7 @@ class product(Iterator[_T_co]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
+@disjoint_base
 class permutations(Iterator[_T_co]):
     @overload
     def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> permutations[tuple[_T, _T]]: ...
@@ -288,6 +302,7 @@ class permutations(Iterator[_T_co]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
+@disjoint_base
 class combinations(Iterator[_T_co]):
     @overload
     def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> combinations[tuple[_T, _T]]: ...
@@ -302,6 +317,7 @@ class combinations(Iterator[_T_co]):
     def __iter__(self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
+@disjoint_base
 class combinations_with_replacement(Iterator[_T_co]):
     @overload
     def __new__(cls, iterable: Iterable[_T], r: Literal[2]) -> combinations_with_replacement[tuple[_T, _T]]: ...
@@ -317,12 +333,14 @@ class combinations_with_replacement(Iterator[_T_co]):
     def __next__(self) -> _T_co: ...
 
 if sys.version_info >= (3, 10):
+    @disjoint_base
     class pairwise(Iterator[_T_co]):
         def __new__(cls, iterable: Iterable[_T], /) -> pairwise[tuple[_T, _T]]: ...
         def __iter__(self) -> Self: ...
         def __next__(self) -> _T_co: ...
 
 if sys.version_info >= (3, 12):
+    @disjoint_base
     class batched(Iterator[tuple[_T_co, ...]], Generic[_T_co]):
         if sys.version_info >= (3, 13):
             def __new__(cls, iterable: Iterable[_T_co], n: int, *, strict: bool = False) -> Self: ...
diff --git a/mypy/typeshed/stdlib/lib2to3/fixes/fix_tuple_params.pyi b/mypy/typeshed/stdlib/lib2to3/fixes/fix_tuple_params.pyi
index bfaa9970c996..7f4f7f4e8656 100644
--- a/mypy/typeshed/stdlib/lib2to3/fixes/fix_tuple_params.pyi
+++ b/mypy/typeshed/stdlib/lib2to3/fixes/fix_tuple_params.pyi
@@ -1,4 +1,3 @@
-from _typeshed import Incomplete
 from typing import ClassVar, Literal
 
 from .. import fixer_base
@@ -13,5 +12,5 @@ class FixTupleParams(fixer_base.BaseFix):
 
 def simplify_args(node): ...
 def find_params(node): ...
-def map_to_index(param_list, prefix=..., d: Incomplete | None = ...): ...
+def map_to_index(param_list, prefix=[], d=None): ...
 def tuple_name(param_list): ...
diff --git a/mypy/typeshed/stdlib/logging/__init__.pyi b/mypy/typeshed/stdlib/logging/__init__.pyi
index 03c79cc3e265..8248f82ea87a 100644
--- a/mypy/typeshed/stdlib/logging/__init__.pyi
+++ b/mypy/typeshed/stdlib/logging/__init__.pyi
@@ -155,7 +155,7 @@ class Logger(Filterer):
         stacklevel: int = 1,
         extra: Mapping[str, object] | None = None,
     ) -> None: ...
-    @deprecated("Deprecated; use warning() instead.")
+    @deprecated("Deprecated since Python 3.3. Use `Logger.warning()` instead.")
     def warn(
         self,
         msg: object,
@@ -409,7 +409,7 @@ class LoggerAdapter(Generic[_L]):
         extra: Mapping[str, object] | None = None,
         **kwargs: object,
     ) -> None: ...
-    @deprecated("Deprecated; use warning() instead.")
+    @deprecated("Deprecated since Python 3.3. Use `LoggerAdapter.warning()` instead.")
     def warn(
         self,
         msg: object,
@@ -519,7 +519,7 @@ def warning(
     stacklevel: int = 1,
     extra: Mapping[str, object] | None = None,
 ) -> None: ...
-@deprecated("Deprecated; use warning() instead.")
+@deprecated("Deprecated since Python 3.3. Use `warning()` instead.")
 def warn(
     msg: object,
     *args: object,
@@ -659,4 +659,4 @@ class StringTemplateStyle(PercentStyle):  # undocumented
 
 _STYLES: Final[dict[str, tuple[PercentStyle, str]]]
 
-BASIC_FORMAT: Final[str]
+BASIC_FORMAT: Final = "%(levelname)s:%(name)s:%(message)s"
diff --git a/mypy/typeshed/stdlib/logging/config.pyi b/mypy/typeshed/stdlib/logging/config.pyi
index 000ba1ebb06e..72412ddc2cea 100644
--- a/mypy/typeshed/stdlib/logging/config.pyi
+++ b/mypy/typeshed/stdlib/logging/config.pyi
@@ -5,11 +5,11 @@ from configparser import RawConfigParser
 from re import Pattern
 from threading import Thread
 from typing import IO, Any, Final, Literal, SupportsIndex, TypedDict, overload, type_check_only
-from typing_extensions import Required, TypeAlias
+from typing_extensions import Required, TypeAlias, disjoint_base
 
 from . import Filter, Filterer, Formatter, Handler, Logger, _FilterType, _FormatStyle, _Level
 
-DEFAULT_LOGGING_CONFIG_PORT: int
+DEFAULT_LOGGING_CONFIG_PORT: Final = 9030
 RESET_ERROR: Final[int]  # undocumented
 IDENTIFIER: Final[Pattern[str]]  # undocumented
 
@@ -100,13 +100,22 @@ class ConvertingList(list[Any], ConvertingMixin):  # undocumented
     def __getitem__(self, key: slice) -> Any: ...
     def pop(self, idx: SupportsIndex = -1) -> Any: ...
 
-class ConvertingTuple(tuple[Any, ...], ConvertingMixin):  # undocumented
-    @overload
-    def __getitem__(self, key: SupportsIndex) -> Any: ...
-    @overload
-    def __getitem__(self, key: slice) -> Any: ...
+if sys.version_info >= (3, 12):
+    class ConvertingTuple(tuple[Any, ...], ConvertingMixin):  # undocumented
+        @overload
+        def __getitem__(self, key: SupportsIndex) -> Any: ...
+        @overload
+        def __getitem__(self, key: slice) -> Any: ...
 
-class BaseConfigurator:  # undocumented
+else:
+    @disjoint_base
+    class ConvertingTuple(tuple[Any, ...], ConvertingMixin):  # undocumented
+        @overload
+        def __getitem__(self, key: SupportsIndex) -> Any: ...
+        @overload
+        def __getitem__(self, key: slice) -> Any: ...
+
+class BaseConfigurator:
     CONVERT_PATTERN: Pattern[str]
     WORD_PATTERN: Pattern[str]
     DOT_PATTERN: Pattern[str]
@@ -115,6 +124,8 @@ class BaseConfigurator:  # undocumented
     value_converters: dict[str, str]
     importer: Callable[..., Any]
 
+    config: dict[str, Any]  # undocumented
+
     def __init__(self, config: _DictConfigArgs | dict[str, Any]) -> None: ...
     def resolve(self, s: str) -> Any: ...
     def ext_convert(self, value: str) -> Any: ...
diff --git a/mypy/typeshed/stdlib/logging/handlers.pyi b/mypy/typeshed/stdlib/logging/handlers.pyi
index e231d1de3fb5..535f1c685183 100644
--- a/mypy/typeshed/stdlib/logging/handlers.pyi
+++ b/mypy/typeshed/stdlib/logging/handlers.pyi
@@ -14,12 +14,12 @@ from typing_extensions import Self
 
 _T = TypeVar("_T")
 
-DEFAULT_TCP_LOGGING_PORT: Final[int]
-DEFAULT_UDP_LOGGING_PORT: Final[int]
-DEFAULT_HTTP_LOGGING_PORT: Final[int]
-DEFAULT_SOAP_LOGGING_PORT: Final[int]
-SYSLOG_UDP_PORT: Final[int]
-SYSLOG_TCP_PORT: Final[int]
+DEFAULT_TCP_LOGGING_PORT: Final = 9020
+DEFAULT_UDP_LOGGING_PORT: Final = 9021
+DEFAULT_HTTP_LOGGING_PORT: Final = 9022
+DEFAULT_SOAP_LOGGING_PORT: Final = 9023
+SYSLOG_UDP_PORT: Final = 514
+SYSLOG_TCP_PORT: Final = 514
 
 class WatchedFileHandler(FileHandler):
     dev: int  # undocumented
diff --git a/mypy/typeshed/stdlib/mmap.pyi b/mypy/typeshed/stdlib/mmap.pyi
index 261a2bfdfc44..8a5baba62914 100644
--- a/mypy/typeshed/stdlib/mmap.pyi
+++ b/mypy/typeshed/stdlib/mmap.pyi
@@ -3,7 +3,7 @@ import sys
 from _typeshed import ReadableBuffer, Unused
 from collections.abc import Iterator
 from typing import Final, Literal, NoReturn, overload
-from typing_extensions import Self
+from typing_extensions import Self, disjoint_base
 
 ACCESS_DEFAULT: Final = 0
 ACCESS_READ: Final = 1
@@ -31,9 +31,10 @@ if sys.platform != "win32":
 
 PAGESIZE: Final[int]
 
+@disjoint_base
 class mmap:
     if sys.platform == "win32":
-        def __init__(self, fileno: int, length: int, tagname: str | None = None, access: int = 0, offset: int = 0) -> None: ...
+        def __new__(self, fileno: int, length: int, tagname: str | None = None, access: int = 0, offset: int = 0) -> Self: ...
     else:
         if sys.version_info >= (3, 13):
             def __new__(
diff --git a/mypy/typeshed/stdlib/msilib/__init__.pyi b/mypy/typeshed/stdlib/msilib/__init__.pyi
index 3e43cbc44f52..622f585f5bee 100644
--- a/mypy/typeshed/stdlib/msilib/__init__.pyi
+++ b/mypy/typeshed/stdlib/msilib/__init__.pyi
@@ -1,26 +1,26 @@
 import sys
 from collections.abc import Container, Iterable, Sequence
 from types import ModuleType
-from typing import Any, Literal
+from typing import Any, Final
 
 if sys.platform == "win32":
     from _msi import *
     from _msi import _Database
 
-    AMD64: bool
-    Win64: bool
+    AMD64: Final[bool]
+    Win64: Final[bool]
 
-    datasizemask: Literal[0x00FF]
-    type_valid: Literal[0x0100]
-    type_localizable: Literal[0x0200]
-    typemask: Literal[0x0C00]
-    type_long: Literal[0x0000]
-    type_short: Literal[0x0400]
-    type_string: Literal[0x0C00]
-    type_binary: Literal[0x0800]
-    type_nullable: Literal[0x1000]
-    type_key: Literal[0x2000]
-    knownbits: Literal[0x3FFF]
+    datasizemask: Final = 0x00FF
+    type_valid: Final = 0x0100
+    type_localizable: Final = 0x0200
+    typemask: Final = 0x0C00
+    type_long: Final = 0x0000
+    type_short: Final = 0x0400
+    type_string: Final = 0x0C00
+    type_binary: Final = 0x0800
+    type_nullable: Final = 0x1000
+    type_key: Final = 0x2000
+    knownbits: Final = 0x3FFF
 
     class Table:
         name: str
diff --git a/mypy/typeshed/stdlib/msilib/schema.pyi b/mypy/typeshed/stdlib/msilib/schema.pyi
index 4ad9a1783fcd..3bbdc41a1e8e 100644
--- a/mypy/typeshed/stdlib/msilib/schema.pyi
+++ b/mypy/typeshed/stdlib/msilib/schema.pyi
@@ -1,4 +1,5 @@
 import sys
+from typing import Final
 
 if sys.platform == "win32":
     from . import Table
@@ -89,6 +90,6 @@ if sys.platform == "win32":
     Upgrade: Table
     Verb: Table
 
-    tables: list[Table]
+    tables: Final[list[Table]]
 
     _Validation_records: list[tuple[str, str, str, int | None, int | None, str | None, int | None, str | None, str | None, str]]
diff --git a/mypy/typeshed/stdlib/msilib/sequence.pyi b/mypy/typeshed/stdlib/msilib/sequence.pyi
index b8af09f46e65..a9f5c24717bd 100644
--- a/mypy/typeshed/stdlib/msilib/sequence.pyi
+++ b/mypy/typeshed/stdlib/msilib/sequence.pyi
@@ -1,13 +1,14 @@
 import sys
+from typing import Final
 from typing_extensions import TypeAlias
 
 if sys.platform == "win32":
     _SequenceType: TypeAlias = list[tuple[str, str | None, int]]
 
-    AdminExecuteSequence: _SequenceType
-    AdminUISequence: _SequenceType
-    AdvtExecuteSequence: _SequenceType
-    InstallExecuteSequence: _SequenceType
-    InstallUISequence: _SequenceType
+    AdminExecuteSequence: Final[_SequenceType]
+    AdminUISequence: Final[_SequenceType]
+    AdvtExecuteSequence: Final[_SequenceType]
+    InstallExecuteSequence: Final[_SequenceType]
+    InstallUISequence: Final[_SequenceType]
 
-    tables: list[str]
+    tables: Final[list[str]]
diff --git a/mypy/typeshed/stdlib/msilib/text.pyi b/mypy/typeshed/stdlib/msilib/text.pyi
index 441c843ca6cf..da3c5fd0fb7a 100644
--- a/mypy/typeshed/stdlib/msilib/text.pyi
+++ b/mypy/typeshed/stdlib/msilib/text.pyi
@@ -1,7 +1,8 @@
 import sys
+from typing import Final
 
 if sys.platform == "win32":
-    ActionText: list[tuple[str, str, str | None]]
-    UIText: list[tuple[str, str | None]]
+    ActionText: Final[list[tuple[str, str, str | None]]]
+    UIText: Final[list[tuple[str, str | None]]]
     dirname: str
-    tables: list[str]
+    tables: Final[list[str]]
diff --git a/mypy/typeshed/stdlib/msvcrt.pyi b/mypy/typeshed/stdlib/msvcrt.pyi
index 403a5d933522..5feca8eab5c1 100644
--- a/mypy/typeshed/stdlib/msvcrt.pyi
+++ b/mypy/typeshed/stdlib/msvcrt.pyi
@@ -9,10 +9,10 @@ if sys.platform == "win32":
     LK_NBLCK: Final = 2
     LK_RLCK: Final = 3
     LK_NBRLCK: Final = 4
-    SEM_FAILCRITICALERRORS: int
-    SEM_NOALIGNMENTFAULTEXCEPT: int
-    SEM_NOGPFAULTERRORBOX: int
-    SEM_NOOPENFILEERRORBOX: int
+    SEM_FAILCRITICALERRORS: Final = 0x0001
+    SEM_NOALIGNMENTFAULTEXCEPT: Final = 0x0004
+    SEM_NOGPFAULTERRORBOX: Final = 0x0002
+    SEM_NOOPENFILEERRORBOX: Final = 0x8000
     def locking(fd: int, mode: int, nbytes: int, /) -> None: ...
     def setmode(fd: int, mode: int, /) -> int: ...
     def open_osfhandle(handle: int, flags: int, /) -> int: ...
diff --git a/mypy/typeshed/stdlib/multiprocessing/managers.pyi b/mypy/typeshed/stdlib/multiprocessing/managers.pyi
index b0ccac41b925..5efe69a97377 100644
--- a/mypy/typeshed/stdlib/multiprocessing/managers.pyi
+++ b/mypy/typeshed/stdlib/multiprocessing/managers.pyi
@@ -38,6 +38,7 @@ class Namespace:
 _Namespace: TypeAlias = Namespace
 
 class Token:
+    __slots__ = ("typeid", "address", "id")
     typeid: str | bytes | None
     address: _Address | None
     id: str | bytes | int | None
diff --git a/mypy/typeshed/stdlib/multiprocessing/util.pyi b/mypy/typeshed/stdlib/multiprocessing/util.pyi
index ecb4a7ddec7d..3583194c77e2 100644
--- a/mypy/typeshed/stdlib/multiprocessing/util.pyi
+++ b/mypy/typeshed/stdlib/multiprocessing/util.pyi
@@ -52,7 +52,7 @@ def get_logger() -> Logger: ...
 def log_to_stderr(level: _LoggingLevel | None = None) -> Logger: ...
 def is_abstract_socket_namespace(address: str | bytes | None) -> bool: ...
 
-abstract_sockets_supported: bool
+abstract_sockets_supported: Final[bool]
 
 def get_temp_dir() -> str: ...
 def register_after_fork(obj: _T, func: Callable[[_T], object]) -> None: ...
diff --git a/mypy/typeshed/stdlib/nturl2path.pyi b/mypy/typeshed/stdlib/nturl2path.pyi
index c38a359469d2..014af8a0fd2e 100644
--- a/mypy/typeshed/stdlib/nturl2path.pyi
+++ b/mypy/typeshed/stdlib/nturl2path.pyi
@@ -2,9 +2,9 @@ import sys
 from typing_extensions import deprecated
 
 if sys.version_info >= (3, 14):
-    @deprecated("nturl2path module was deprecated since Python 3.14")
+    @deprecated("The `nturl2path` module is deprecated since Python 3.14.")
     def url2pathname(url: str) -> str: ...
-    @deprecated("nturl2path module was deprecated since Python 3.14")
+    @deprecated("The `nturl2path` module is deprecated since Python 3.14.")
     def pathname2url(p: str) -> str: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/numbers.pyi b/mypy/typeshed/stdlib/numbers.pyi
index b24591719cff..64fb16581e95 100644
--- a/mypy/typeshed/stdlib/numbers.pyi
+++ b/mypy/typeshed/stdlib/numbers.pyi
@@ -61,12 +61,14 @@ class _IntegralLike(_RealLike, Protocol):
 #################
 
 class Number(metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __hash__(self) -> int: ...
 
 # See comment at the top of the file
 # for why some of these return types are purposefully vague
 class Complex(Number, _ComplexLike):
+    __slots__ = ()
     @abstractmethod
     def __complex__(self) -> complex: ...
     def __bool__(self) -> bool: ...
@@ -109,6 +111,7 @@ class Complex(Number, _ComplexLike):
 # See comment at the top of the file
 # for why some of these return types are purposefully vague
 class Real(Complex, _RealLike):
+    __slots__ = ()
     @abstractmethod
     def __float__(self) -> float: ...
     @abstractmethod
@@ -153,6 +156,7 @@ class Real(Complex, _RealLike):
 # See comment at the top of the file
 # for why some of these return types are purposefully vague
 class Rational(Real):
+    __slots__ = ()
     @property
     @abstractmethod
     def numerator(self) -> _IntegralLike: ...
@@ -164,6 +168,7 @@ class Rational(Real):
 # See comment at the top of the file
 # for why some of these return types are purposefully vague
 class Integral(Rational, _IntegralLike):
+    __slots__ = ()
     @abstractmethod
     def __int__(self) -> int: ...
     def __index__(self) -> int: ...
diff --git a/mypy/typeshed/stdlib/opcode.pyi b/mypy/typeshed/stdlib/opcode.pyi
index a5a3a79c323b..ed0e96ef1cb9 100644
--- a/mypy/typeshed/stdlib/opcode.pyi
+++ b/mypy/typeshed/stdlib/opcode.pyi
@@ -1,5 +1,5 @@
 import sys
-from typing import Literal
+from typing import Final, Literal
 
 __all__ = [
     "cmp_op",
@@ -24,24 +24,24 @@ if sys.version_info >= (3, 13):
     __all__ += ["hasjump"]
 
 cmp_op: tuple[Literal["<"], Literal["<="], Literal["=="], Literal["!="], Literal[">"], Literal[">="]]
-hasconst: list[int]
-hasname: list[int]
-hasjrel: list[int]
-hasjabs: list[int]
-haslocal: list[int]
-hascompare: list[int]
-hasfree: list[int]
+hasconst: Final[list[int]]
+hasname: Final[list[int]]
+hasjrel: Final[list[int]]
+hasjabs: Final[list[int]]
+haslocal: Final[list[int]]
+hascompare: Final[list[int]]
+hasfree: Final[list[int]]
 if sys.version_info >= (3, 12):
-    hasarg: list[int]
-    hasexc: list[int]
+    hasarg: Final[list[int]]
+    hasexc: Final[list[int]]
 else:
-    hasnargs: list[int]
+    hasnargs: Final[list[int]]
 if sys.version_info >= (3, 13):
-    hasjump: list[int]
-opname: list[str]
+    hasjump: Final[list[int]]
+opname: Final[list[str]]
 
-opmap: dict[str, int]
-HAVE_ARGUMENT: int
-EXTENDED_ARG: int
+opmap: Final[dict[str, int]]
+HAVE_ARGUMENT: Final = 43
+EXTENDED_ARG: Final = 69
 
 def stack_effect(opcode: int, oparg: int | None = None, /, *, jump: bool | None = None) -> int: ...
diff --git a/mypy/typeshed/stdlib/os/__init__.pyi b/mypy/typeshed/stdlib/os/__init__.pyi
index 4047bb0f1c4d..71c79dfac399 100644
--- a/mypy/typeshed/stdlib/os/__init__.pyi
+++ b/mypy/typeshed/stdlib/os/__init__.pyi
@@ -509,22 +509,22 @@ supports_follow_symlinks: set[Callable[..., Any]]
 
 if sys.platform != "win32":
     # Unix only
-    PRIO_PROCESS: int
-    PRIO_PGRP: int
-    PRIO_USER: int
+    PRIO_PROCESS: Final[int]
+    PRIO_PGRP: Final[int]
+    PRIO_USER: Final[int]
 
-    F_LOCK: int
-    F_TLOCK: int
-    F_ULOCK: int
-    F_TEST: int
+    F_LOCK: Final[int]
+    F_TLOCK: Final[int]
+    F_ULOCK: Final[int]
+    F_TEST: Final[int]
 
     if sys.platform != "darwin":
-        POSIX_FADV_NORMAL: int
-        POSIX_FADV_SEQUENTIAL: int
-        POSIX_FADV_RANDOM: int
-        POSIX_FADV_NOREUSE: int
-        POSIX_FADV_WILLNEED: int
-        POSIX_FADV_DONTNEED: int
+        POSIX_FADV_NORMAL: Final[int]
+        POSIX_FADV_SEQUENTIAL: Final[int]
+        POSIX_FADV_RANDOM: Final[int]
+        POSIX_FADV_NOREUSE: Final[int]
+        POSIX_FADV_WILLNEED: Final[int]
+        POSIX_FADV_DONTNEED: Final[int]
 
     if sys.platform != "linux" and sys.platform != "darwin":
         # In the os-module docs, these are marked as being available
@@ -534,69 +534,69 @@ if sys.platform != "win32":
         # so the sys-module docs recommend doing `if sys.platform.startswith('freebsd')`
         # to detect FreeBSD builds. Unfortunately that would be too dynamic
         # for type checkers, however.
-        SF_NODISKIO: int
-        SF_MNOWAIT: int
-        SF_SYNC: int
+        SF_NODISKIO: Final[int]
+        SF_MNOWAIT: Final[int]
+        SF_SYNC: Final[int]
 
         if sys.version_info >= (3, 11):
-            SF_NOCACHE: int
+            SF_NOCACHE: Final[int]
 
     if sys.platform == "linux":
-        XATTR_SIZE_MAX: int
-        XATTR_CREATE: int
-        XATTR_REPLACE: int
+        XATTR_SIZE_MAX: Final[int]
+        XATTR_CREATE: Final[int]
+        XATTR_REPLACE: Final[int]
 
-    P_PID: int
-    P_PGID: int
-    P_ALL: int
+    P_PID: Final[int]
+    P_PGID: Final[int]
+    P_ALL: Final[int]
 
     if sys.platform == "linux":
-        P_PIDFD: int
-
-    WEXITED: int
-    WSTOPPED: int
-    WNOWAIT: int
-
-    CLD_EXITED: int
-    CLD_DUMPED: int
-    CLD_TRAPPED: int
-    CLD_CONTINUED: int
-    CLD_KILLED: int
-    CLD_STOPPED: int
-
-    SCHED_OTHER: int
-    SCHED_FIFO: int
-    SCHED_RR: int
+        P_PIDFD: Final[int]
+
+    WEXITED: Final[int]
+    WSTOPPED: Final[int]
+    WNOWAIT: Final[int]
+
+    CLD_EXITED: Final[int]
+    CLD_DUMPED: Final[int]
+    CLD_TRAPPED: Final[int]
+    CLD_CONTINUED: Final[int]
+    CLD_KILLED: Final[int]
+    CLD_STOPPED: Final[int]
+
+    SCHED_OTHER: Final[int]
+    SCHED_FIFO: Final[int]
+    SCHED_RR: Final[int]
     if sys.platform != "darwin" and sys.platform != "linux":
-        SCHED_SPORADIC: int
+        SCHED_SPORADIC: Final[int]
 
 if sys.platform == "linux":
-    SCHED_BATCH: int
-    SCHED_IDLE: int
-    SCHED_RESET_ON_FORK: int
+    SCHED_BATCH: Final[int]
+    SCHED_IDLE: Final[int]
+    SCHED_RESET_ON_FORK: Final[int]
 
 if sys.version_info >= (3, 14) and sys.platform == "linux":
-    SCHED_DEADLINE: int
-    SCHED_NORMAL: int
+    SCHED_DEADLINE: Final[int]
+    SCHED_NORMAL: Final[int]
 
 if sys.platform != "win32":
-    RTLD_LAZY: int
-    RTLD_NOW: int
-    RTLD_GLOBAL: int
-    RTLD_LOCAL: int
-    RTLD_NODELETE: int
-    RTLD_NOLOAD: int
+    RTLD_LAZY: Final[int]
+    RTLD_NOW: Final[int]
+    RTLD_GLOBAL: Final[int]
+    RTLD_LOCAL: Final[int]
+    RTLD_NODELETE: Final[int]
+    RTLD_NOLOAD: Final[int]
 
 if sys.platform == "linux":
-    RTLD_DEEPBIND: int
-    GRND_NONBLOCK: int
-    GRND_RANDOM: int
+    RTLD_DEEPBIND: Final[int]
+    GRND_NONBLOCK: Final[int]
+    GRND_RANDOM: Final[int]
 
 if sys.platform == "darwin" and sys.version_info >= (3, 12):
-    PRIO_DARWIN_BG: int
-    PRIO_DARWIN_NONUI: int
-    PRIO_DARWIN_PROCESS: int
-    PRIO_DARWIN_THREAD: int
+    PRIO_DARWIN_BG: Final[int]
+    PRIO_DARWIN_NONUI: Final[int]
+    PRIO_DARWIN_PROCESS: Final[int]
+    PRIO_DARWIN_THREAD: Final[int]
 
 SEEK_SET: Final = 0
 SEEK_CUR: Final = 1
@@ -605,74 +605,74 @@ if sys.platform != "win32":
     SEEK_DATA: Final = 3
     SEEK_HOLE: Final = 4
 
-O_RDONLY: int
-O_WRONLY: int
-O_RDWR: int
-O_APPEND: int
-O_CREAT: int
-O_EXCL: int
-O_TRUNC: int
+O_RDONLY: Final[int]
+O_WRONLY: Final[int]
+O_RDWR: Final[int]
+O_APPEND: Final[int]
+O_CREAT: Final[int]
+O_EXCL: Final[int]
+O_TRUNC: Final[int]
 if sys.platform == "win32":
-    O_BINARY: int
-    O_NOINHERIT: int
-    O_SHORT_LIVED: int
-    O_TEMPORARY: int
-    O_RANDOM: int
-    O_SEQUENTIAL: int
-    O_TEXT: int
+    O_BINARY: Final[int]
+    O_NOINHERIT: Final[int]
+    O_SHORT_LIVED: Final[int]
+    O_TEMPORARY: Final[int]
+    O_RANDOM: Final[int]
+    O_SEQUENTIAL: Final[int]
+    O_TEXT: Final[int]
 
 if sys.platform != "win32":
-    O_DSYNC: int
-    O_SYNC: int
-    O_NDELAY: int
-    O_NONBLOCK: int
-    O_NOCTTY: int
-    O_CLOEXEC: int
-    O_ASYNC: int  # Gnu extension if in C library
-    O_DIRECTORY: int  # Gnu extension if in C library
-    O_NOFOLLOW: int  # Gnu extension if in C library
-    O_ACCMODE: int  # TODO: when does this exist?
+    O_DSYNC: Final[int]
+    O_SYNC: Final[int]
+    O_NDELAY: Final[int]
+    O_NONBLOCK: Final[int]
+    O_NOCTTY: Final[int]
+    O_CLOEXEC: Final[int]
+    O_ASYNC: Final[int]  # Gnu extension if in C library
+    O_DIRECTORY: Final[int]  # Gnu extension if in C library
+    O_NOFOLLOW: Final[int]  # Gnu extension if in C library
+    O_ACCMODE: Final[int]  # TODO: when does this exist?
 
 if sys.platform == "linux":
-    O_RSYNC: int
-    O_DIRECT: int  # Gnu extension if in C library
-    O_NOATIME: int  # Gnu extension if in C library
-    O_PATH: int  # Gnu extension if in C library
-    O_TMPFILE: int  # Gnu extension if in C library
-    O_LARGEFILE: int  # Gnu extension if in C library
+    O_RSYNC: Final[int]
+    O_DIRECT: Final[int]  # Gnu extension if in C library
+    O_NOATIME: Final[int]  # Gnu extension if in C library
+    O_PATH: Final[int]  # Gnu extension if in C library
+    O_TMPFILE: Final[int]  # Gnu extension if in C library
+    O_LARGEFILE: Final[int]  # Gnu extension if in C library
 
 if sys.platform != "linux" and sys.platform != "win32":
-    O_SHLOCK: int
-    O_EXLOCK: int
+    O_SHLOCK: Final[int]
+    O_EXLOCK: Final[int]
 
 if sys.platform == "darwin" and sys.version_info >= (3, 10):
-    O_EVTONLY: int
-    O_NOFOLLOW_ANY: int
-    O_SYMLINK: int
+    O_EVTONLY: Final[int]
+    O_NOFOLLOW_ANY: Final[int]
+    O_SYMLINK: Final[int]
 
 if sys.platform != "win32" and sys.version_info >= (3, 10):
-    O_FSYNC: int
+    O_FSYNC: Final[int]
 
 if sys.platform != "linux" and sys.platform != "win32" and sys.version_info >= (3, 13):
-    O_EXEC: int
-    O_SEARCH: int
+    O_EXEC: Final[int]
+    O_SEARCH: Final[int]
 
 if sys.platform != "win32" and sys.platform != "darwin":
     # posix, but apparently missing on macos
-    ST_APPEND: int
-    ST_MANDLOCK: int
-    ST_NOATIME: int
-    ST_NODEV: int
-    ST_NODIRATIME: int
-    ST_NOEXEC: int
-    ST_RELATIME: int
-    ST_SYNCHRONOUS: int
-    ST_WRITE: int
+    ST_APPEND: Final[int]
+    ST_MANDLOCK: Final[int]
+    ST_NOATIME: Final[int]
+    ST_NODEV: Final[int]
+    ST_NODIRATIME: Final[int]
+    ST_NOEXEC: Final[int]
+    ST_RELATIME: Final[int]
+    ST_SYNCHRONOUS: Final[int]
+    ST_WRITE: Final[int]
 
 if sys.platform != "win32":
-    NGROUPS_MAX: int
-    ST_NOSUID: int
-    ST_RDONLY: int
+    NGROUPS_MAX: Final[int]
+    ST_NOSUID: Final[int]
+    ST_RDONLY: Final[int]
 
 curdir: str
 pardir: str
@@ -688,10 +688,10 @@ linesep: Literal["\n", "\r\n"]
 devnull: str
 name: str
 
-F_OK: int
-R_OK: int
-W_OK: int
-X_OK: int
+F_OK: Final = 0
+R_OK: Final = 4
+W_OK: Final = 2
+X_OK: Final = 1
 
 _EnvironCodeFunc: TypeAlias = Callable[[AnyStr], AnyStr]
 
@@ -730,47 +730,47 @@ if sys.platform != "win32":
     environb: _Environ[bytes]
 
 if sys.version_info >= (3, 11) or sys.platform != "win32":
-    EX_OK: int
+    EX_OK: Final[int]
 
 if sys.platform != "win32":
     confstr_names: dict[str, int]
     pathconf_names: dict[str, int]
     sysconf_names: dict[str, int]
 
-    EX_USAGE: int
-    EX_DATAERR: int
-    EX_NOINPUT: int
-    EX_NOUSER: int
-    EX_NOHOST: int
-    EX_UNAVAILABLE: int
-    EX_SOFTWARE: int
-    EX_OSERR: int
-    EX_OSFILE: int
-    EX_CANTCREAT: int
-    EX_IOERR: int
-    EX_TEMPFAIL: int
-    EX_PROTOCOL: int
-    EX_NOPERM: int
-    EX_CONFIG: int
+    EX_USAGE: Final[int]
+    EX_DATAERR: Final[int]
+    EX_NOINPUT: Final[int]
+    EX_NOUSER: Final[int]
+    EX_NOHOST: Final[int]
+    EX_UNAVAILABLE: Final[int]
+    EX_SOFTWARE: Final[int]
+    EX_OSERR: Final[int]
+    EX_OSFILE: Final[int]
+    EX_CANTCREAT: Final[int]
+    EX_IOERR: Final[int]
+    EX_TEMPFAIL: Final[int]
+    EX_PROTOCOL: Final[int]
+    EX_NOPERM: Final[int]
+    EX_CONFIG: Final[int]
 
 # Exists on some Unix platforms, e.g. Solaris.
 if sys.platform != "win32" and sys.platform != "darwin" and sys.platform != "linux":
-    EX_NOTFOUND: int
+    EX_NOTFOUND: Final[int]
 
-P_NOWAIT: int
-P_NOWAITO: int
-P_WAIT: int
+P_NOWAIT: Final[int]
+P_NOWAITO: Final[int]
+P_WAIT: Final[int]
 if sys.platform == "win32":
-    P_DETACH: int
-    P_OVERLAY: int
+    P_DETACH: Final[int]
+    P_OVERLAY: Final[int]
 
 # wait()/waitpid() options
 if sys.platform != "win32":
-    WNOHANG: int  # Unix only
-    WCONTINUED: int  # some Unix systems
-    WUNTRACED: int  # Unix only
+    WNOHANG: Final[int]  # Unix only
+    WCONTINUED: Final[int]  # some Unix systems
+    WUNTRACED: Final[int]  # Unix only
 
-TMP_MAX: int  # Undocumented, but used by tempfile
+TMP_MAX: Final[int]  # Undocumented, but used by tempfile
 
 # ----- os classes (structures) -----
 @final
@@ -862,6 +862,7 @@ In the future, this property will contain the last metadata change time."""
 # on the allowlist for use as a Protocol starting in 3.14.
 @runtime_checkable
 class PathLike(ABC, Protocol[AnyStr_co]):  # type: ignore[misc]  # pyright: ignore[reportGeneralTypeIssues]
+    __slots__ = ()
     @abstractmethod
     def __fspath__(self) -> AnyStr_co: ...
 
@@ -1136,11 +1137,11 @@ if sys.platform != "win32":
     def pwritev(fd: int, buffers: SupportsLenAndGetItem[ReadableBuffer], offset: int, flags: int = 0, /) -> int: ...
     if sys.platform != "darwin":
         if sys.version_info >= (3, 10):
-            RWF_APPEND: int  # docs say available on 3.7+, stubtest says otherwise
-        RWF_DSYNC: int
-        RWF_SYNC: int
-        RWF_HIPRI: int
-        RWF_NOWAIT: int
+            RWF_APPEND: Final[int]  # docs say available on 3.7+, stubtest says otherwise
+        RWF_DSYNC: Final[int]
+        RWF_SYNC: Final[int]
+        RWF_HIPRI: Final[int]
+        RWF_NOWAIT: Final[int]
 
     if sys.platform == "linux":
         def sendfile(out_fd: FileDescriptor, in_fd: FileDescriptor, offset: int | None, count: int) -> int: ...
@@ -1150,8 +1151,8 @@ if sys.platform != "win32":
             in_fd: FileDescriptor,
             offset: int,
             count: int,
-            headers: Sequence[ReadableBuffer] = ...,
-            trailers: Sequence[ReadableBuffer] = ...,
+            headers: Sequence[ReadableBuffer] = (),
+            trailers: Sequence[ReadableBuffer] = (),
             flags: int = 0,
         ) -> int: ...  # FreeBSD and Mac OS X only
 
@@ -1196,7 +1197,7 @@ if sys.platform != "win32":
 
 def getcwd() -> str: ...
 def getcwdb() -> bytes: ...
-def chmod(path: FileDescriptorOrPath, mode: int, *, dir_fd: int | None = None, follow_symlinks: bool = ...) -> None: ...
+def chmod(path: FileDescriptorOrPath, mode: int, *, dir_fd: int | None = None, follow_symlinks: bool = True) -> None: ...
 
 if sys.platform != "win32" and sys.platform != "linux":
     def chflags(path: StrOrBytesPath, flags: int, follow_symlinks: bool = True) -> None: ...  # some flavors of Unix
@@ -1499,9 +1500,9 @@ else:
         setsigdef: Iterable[int] = ...,
         scheduler: tuple[Any, sched_param] | None = ...,
     ) -> int: ...
-    POSIX_SPAWN_OPEN: int
-    POSIX_SPAWN_CLOSE: int
-    POSIX_SPAWN_DUP2: int
+    POSIX_SPAWN_OPEN: Final = 0
+    POSIX_SPAWN_CLOSE: Final = 1
+    POSIX_SPAWN_DUP2: Final = 2
 
 if sys.platform != "win32":
     @final
@@ -1565,23 +1566,23 @@ if sys.platform == "win32":
     def add_dll_directory(path: str) -> _AddedDllDirectory: ...
 
 if sys.platform == "linux":
-    MFD_CLOEXEC: int
-    MFD_ALLOW_SEALING: int
-    MFD_HUGETLB: int
-    MFD_HUGE_SHIFT: int
-    MFD_HUGE_MASK: int
-    MFD_HUGE_64KB: int
-    MFD_HUGE_512KB: int
-    MFD_HUGE_1MB: int
-    MFD_HUGE_2MB: int
-    MFD_HUGE_8MB: int
-    MFD_HUGE_16MB: int
-    MFD_HUGE_32MB: int
-    MFD_HUGE_256MB: int
-    MFD_HUGE_512MB: int
-    MFD_HUGE_1GB: int
-    MFD_HUGE_2GB: int
-    MFD_HUGE_16GB: int
+    MFD_CLOEXEC: Final[int]
+    MFD_ALLOW_SEALING: Final[int]
+    MFD_HUGETLB: Final[int]
+    MFD_HUGE_SHIFT: Final[int]
+    MFD_HUGE_MASK: Final[int]
+    MFD_HUGE_64KB: Final[int]
+    MFD_HUGE_512KB: Final[int]
+    MFD_HUGE_1MB: Final[int]
+    MFD_HUGE_2MB: Final[int]
+    MFD_HUGE_8MB: Final[int]
+    MFD_HUGE_16MB: Final[int]
+    MFD_HUGE_32MB: Final[int]
+    MFD_HUGE_256MB: Final[int]
+    MFD_HUGE_512MB: Final[int]
+    MFD_HUGE_1GB: Final[int]
+    MFD_HUGE_2GB: Final[int]
+    MFD_HUGE_16GB: Final[int]
     def memfd_create(name: str, flags: int = ...) -> int: ...
     def copy_file_range(src: int, dst: int, count: int, offset_src: int | None = ..., offset_dst: int | None = ...) -> int: ...
 
@@ -1599,12 +1600,12 @@ if sys.version_info >= (3, 12) and sys.platform == "win32":
     def listvolumes() -> list[str]: ...
 
 if sys.version_info >= (3, 10) and sys.platform == "linux":
-    EFD_CLOEXEC: int
-    EFD_NONBLOCK: int
-    EFD_SEMAPHORE: int
-    SPLICE_F_MORE: int
-    SPLICE_F_MOVE: int
-    SPLICE_F_NONBLOCK: int
+    EFD_CLOEXEC: Final[int]
+    EFD_NONBLOCK: Final[int]
+    EFD_SEMAPHORE: Final[int]
+    SPLICE_F_MORE: Final[int]
+    SPLICE_F_MOVE: Final[int]
+    SPLICE_F_NONBLOCK: Final[int]
     def eventfd(initval: int, flags: int = 524288) -> FileDescriptor: ...
     def eventfd_read(fd: FileDescriptor) -> int: ...
     def eventfd_write(fd: FileDescriptor, value: int) -> None: ...
@@ -1618,20 +1619,20 @@ if sys.version_info >= (3, 10) and sys.platform == "linux":
     ) -> int: ...
 
 if sys.version_info >= (3, 12) and sys.platform == "linux":
-    CLONE_FILES: int
-    CLONE_FS: int
-    CLONE_NEWCGROUP: int  # Linux 4.6+
-    CLONE_NEWIPC: int  # Linux 2.6.19+
-    CLONE_NEWNET: int  # Linux 2.6.24+
-    CLONE_NEWNS: int
-    CLONE_NEWPID: int  # Linux 3.8+
-    CLONE_NEWTIME: int  # Linux 5.6+
-    CLONE_NEWUSER: int  # Linux 3.8+
-    CLONE_NEWUTS: int  # Linux 2.6.19+
-    CLONE_SIGHAND: int
-    CLONE_SYSVSEM: int  # Linux 2.6.26+
-    CLONE_THREAD: int
-    CLONE_VM: int
+    CLONE_FILES: Final[int]
+    CLONE_FS: Final[int]
+    CLONE_NEWCGROUP: Final[int]  # Linux 4.6+
+    CLONE_NEWIPC: Final[int]  # Linux 2.6.19+
+    CLONE_NEWNET: Final[int]  # Linux 2.6.24+
+    CLONE_NEWNS: Final[int]
+    CLONE_NEWPID: Final[int]  # Linux 3.8+
+    CLONE_NEWTIME: Final[int]  # Linux 5.6+
+    CLONE_NEWUSER: Final[int]  # Linux 3.8+
+    CLONE_NEWUTS: Final[int]  # Linux 2.6.19+
+    CLONE_SIGHAND: Final[int]
+    CLONE_SYSVSEM: Final[int]  # Linux 2.6.26+
+    CLONE_THREAD: Final[int]
+    CLONE_VM: Final[int]
     def unshare(flags: int) -> None: ...
     def setns(fd: FileDescriptorLike, nstype: int = 0) -> None: ...
 
diff --git a/mypy/typeshed/stdlib/ossaudiodev.pyi b/mypy/typeshed/stdlib/ossaudiodev.pyi
index b9ee3edab033..f8230b4f0212 100644
--- a/mypy/typeshed/stdlib/ossaudiodev.pyi
+++ b/mypy/typeshed/stdlib/ossaudiodev.pyi
@@ -1,119 +1,120 @@
 import sys
-from typing import Any, Literal, overload
+from typing import Any, Final, Literal, overload
 
 if sys.platform != "win32" and sys.platform != "darwin":
-    AFMT_AC3: int
-    AFMT_A_LAW: int
-    AFMT_IMA_ADPCM: int
-    AFMT_MPEG: int
-    AFMT_MU_LAW: int
-    AFMT_QUERY: int
-    AFMT_S16_BE: int
-    AFMT_S16_LE: int
-    AFMT_S16_NE: int
-    AFMT_S8: int
-    AFMT_U16_BE: int
-    AFMT_U16_LE: int
-    AFMT_U8: int
-    SNDCTL_COPR_HALT: int
-    SNDCTL_COPR_LOAD: int
-    SNDCTL_COPR_RCODE: int
-    SNDCTL_COPR_RCVMSG: int
-    SNDCTL_COPR_RDATA: int
-    SNDCTL_COPR_RESET: int
-    SNDCTL_COPR_RUN: int
-    SNDCTL_COPR_SENDMSG: int
-    SNDCTL_COPR_WCODE: int
-    SNDCTL_COPR_WDATA: int
-    SNDCTL_DSP_BIND_CHANNEL: int
-    SNDCTL_DSP_CHANNELS: int
-    SNDCTL_DSP_GETBLKSIZE: int
-    SNDCTL_DSP_GETCAPS: int
-    SNDCTL_DSP_GETCHANNELMASK: int
-    SNDCTL_DSP_GETFMTS: int
-    SNDCTL_DSP_GETIPTR: int
-    SNDCTL_DSP_GETISPACE: int
-    SNDCTL_DSP_GETODELAY: int
-    SNDCTL_DSP_GETOPTR: int
-    SNDCTL_DSP_GETOSPACE: int
-    SNDCTL_DSP_GETSPDIF: int
-    SNDCTL_DSP_GETTRIGGER: int
-    SNDCTL_DSP_MAPINBUF: int
-    SNDCTL_DSP_MAPOUTBUF: int
-    SNDCTL_DSP_NONBLOCK: int
-    SNDCTL_DSP_POST: int
-    SNDCTL_DSP_PROFILE: int
-    SNDCTL_DSP_RESET: int
-    SNDCTL_DSP_SAMPLESIZE: int
-    SNDCTL_DSP_SETDUPLEX: int
-    SNDCTL_DSP_SETFMT: int
-    SNDCTL_DSP_SETFRAGMENT: int
-    SNDCTL_DSP_SETSPDIF: int
-    SNDCTL_DSP_SETSYNCRO: int
-    SNDCTL_DSP_SETTRIGGER: int
-    SNDCTL_DSP_SPEED: int
-    SNDCTL_DSP_STEREO: int
-    SNDCTL_DSP_SUBDIVIDE: int
-    SNDCTL_DSP_SYNC: int
-    SNDCTL_FM_4OP_ENABLE: int
-    SNDCTL_FM_LOAD_INSTR: int
-    SNDCTL_MIDI_INFO: int
-    SNDCTL_MIDI_MPUCMD: int
-    SNDCTL_MIDI_MPUMODE: int
-    SNDCTL_MIDI_PRETIME: int
-    SNDCTL_SEQ_CTRLRATE: int
-    SNDCTL_SEQ_GETINCOUNT: int
-    SNDCTL_SEQ_GETOUTCOUNT: int
-    SNDCTL_SEQ_GETTIME: int
-    SNDCTL_SEQ_NRMIDIS: int
-    SNDCTL_SEQ_NRSYNTHS: int
-    SNDCTL_SEQ_OUTOFBAND: int
-    SNDCTL_SEQ_PANIC: int
-    SNDCTL_SEQ_PERCMODE: int
-    SNDCTL_SEQ_RESET: int
-    SNDCTL_SEQ_RESETSAMPLES: int
-    SNDCTL_SEQ_SYNC: int
-    SNDCTL_SEQ_TESTMIDI: int
-    SNDCTL_SEQ_THRESHOLD: int
-    SNDCTL_SYNTH_CONTROL: int
-    SNDCTL_SYNTH_ID: int
-    SNDCTL_SYNTH_INFO: int
-    SNDCTL_SYNTH_MEMAVL: int
-    SNDCTL_SYNTH_REMOVESAMPLE: int
-    SNDCTL_TMR_CONTINUE: int
-    SNDCTL_TMR_METRONOME: int
-    SNDCTL_TMR_SELECT: int
-    SNDCTL_TMR_SOURCE: int
-    SNDCTL_TMR_START: int
-    SNDCTL_TMR_STOP: int
-    SNDCTL_TMR_TEMPO: int
-    SNDCTL_TMR_TIMEBASE: int
-    SOUND_MIXER_ALTPCM: int
-    SOUND_MIXER_BASS: int
-    SOUND_MIXER_CD: int
-    SOUND_MIXER_DIGITAL1: int
-    SOUND_MIXER_DIGITAL2: int
-    SOUND_MIXER_DIGITAL3: int
-    SOUND_MIXER_IGAIN: int
-    SOUND_MIXER_IMIX: int
-    SOUND_MIXER_LINE: int
-    SOUND_MIXER_LINE1: int
-    SOUND_MIXER_LINE2: int
-    SOUND_MIXER_LINE3: int
-    SOUND_MIXER_MIC: int
-    SOUND_MIXER_MONITOR: int
-    SOUND_MIXER_NRDEVICES: int
-    SOUND_MIXER_OGAIN: int
-    SOUND_MIXER_PCM: int
-    SOUND_MIXER_PHONEIN: int
-    SOUND_MIXER_PHONEOUT: int
-    SOUND_MIXER_RADIO: int
-    SOUND_MIXER_RECLEV: int
-    SOUND_MIXER_SPEAKER: int
-    SOUND_MIXER_SYNTH: int
-    SOUND_MIXER_TREBLE: int
-    SOUND_MIXER_VIDEO: int
-    SOUND_MIXER_VOLUME: int
+    # Depends on soundcard.h
+    AFMT_AC3: Final[int]
+    AFMT_A_LAW: Final[int]
+    AFMT_IMA_ADPCM: Final[int]
+    AFMT_MPEG: Final[int]
+    AFMT_MU_LAW: Final[int]
+    AFMT_QUERY: Final[int]
+    AFMT_S16_BE: Final[int]
+    AFMT_S16_LE: Final[int]
+    AFMT_S16_NE: Final[int]
+    AFMT_S8: Final[int]
+    AFMT_U16_BE: Final[int]
+    AFMT_U16_LE: Final[int]
+    AFMT_U8: Final[int]
+    SNDCTL_COPR_HALT: Final[int]
+    SNDCTL_COPR_LOAD: Final[int]
+    SNDCTL_COPR_RCODE: Final[int]
+    SNDCTL_COPR_RCVMSG: Final[int]
+    SNDCTL_COPR_RDATA: Final[int]
+    SNDCTL_COPR_RESET: Final[int]
+    SNDCTL_COPR_RUN: Final[int]
+    SNDCTL_COPR_SENDMSG: Final[int]
+    SNDCTL_COPR_WCODE: Final[int]
+    SNDCTL_COPR_WDATA: Final[int]
+    SNDCTL_DSP_BIND_CHANNEL: Final[int]
+    SNDCTL_DSP_CHANNELS: Final[int]
+    SNDCTL_DSP_GETBLKSIZE: Final[int]
+    SNDCTL_DSP_GETCAPS: Final[int]
+    SNDCTL_DSP_GETCHANNELMASK: Final[int]
+    SNDCTL_DSP_GETFMTS: Final[int]
+    SNDCTL_DSP_GETIPTR: Final[int]
+    SNDCTL_DSP_GETISPACE: Final[int]
+    SNDCTL_DSP_GETODELAY: Final[int]
+    SNDCTL_DSP_GETOPTR: Final[int]
+    SNDCTL_DSP_GETOSPACE: Final[int]
+    SNDCTL_DSP_GETSPDIF: Final[int]
+    SNDCTL_DSP_GETTRIGGER: Final[int]
+    SNDCTL_DSP_MAPINBUF: Final[int]
+    SNDCTL_DSP_MAPOUTBUF: Final[int]
+    SNDCTL_DSP_NONBLOCK: Final[int]
+    SNDCTL_DSP_POST: Final[int]
+    SNDCTL_DSP_PROFILE: Final[int]
+    SNDCTL_DSP_RESET: Final[int]
+    SNDCTL_DSP_SAMPLESIZE: Final[int]
+    SNDCTL_DSP_SETDUPLEX: Final[int]
+    SNDCTL_DSP_SETFMT: Final[int]
+    SNDCTL_DSP_SETFRAGMENT: Final[int]
+    SNDCTL_DSP_SETSPDIF: Final[int]
+    SNDCTL_DSP_SETSYNCRO: Final[int]
+    SNDCTL_DSP_SETTRIGGER: Final[int]
+    SNDCTL_DSP_SPEED: Final[int]
+    SNDCTL_DSP_STEREO: Final[int]
+    SNDCTL_DSP_SUBDIVIDE: Final[int]
+    SNDCTL_DSP_SYNC: Final[int]
+    SNDCTL_FM_4OP_ENABLE: Final[int]
+    SNDCTL_FM_LOAD_INSTR: Final[int]
+    SNDCTL_MIDI_INFO: Final[int]
+    SNDCTL_MIDI_MPUCMD: Final[int]
+    SNDCTL_MIDI_MPUMODE: Final[int]
+    SNDCTL_MIDI_PRETIME: Final[int]
+    SNDCTL_SEQ_CTRLRATE: Final[int]
+    SNDCTL_SEQ_GETINCOUNT: Final[int]
+    SNDCTL_SEQ_GETOUTCOUNT: Final[int]
+    SNDCTL_SEQ_GETTIME: Final[int]
+    SNDCTL_SEQ_NRMIDIS: Final[int]
+    SNDCTL_SEQ_NRSYNTHS: Final[int]
+    SNDCTL_SEQ_OUTOFBAND: Final[int]
+    SNDCTL_SEQ_PANIC: Final[int]
+    SNDCTL_SEQ_PERCMODE: Final[int]
+    SNDCTL_SEQ_RESET: Final[int]
+    SNDCTL_SEQ_RESETSAMPLES: Final[int]
+    SNDCTL_SEQ_SYNC: Final[int]
+    SNDCTL_SEQ_TESTMIDI: Final[int]
+    SNDCTL_SEQ_THRESHOLD: Final[int]
+    SNDCTL_SYNTH_CONTROL: Final[int]
+    SNDCTL_SYNTH_ID: Final[int]
+    SNDCTL_SYNTH_INFO: Final[int]
+    SNDCTL_SYNTH_MEMAVL: Final[int]
+    SNDCTL_SYNTH_REMOVESAMPLE: Final[int]
+    SNDCTL_TMR_CONTINUE: Final[int]
+    SNDCTL_TMR_METRONOME: Final[int]
+    SNDCTL_TMR_SELECT: Final[int]
+    SNDCTL_TMR_SOURCE: Final[int]
+    SNDCTL_TMR_START: Final[int]
+    SNDCTL_TMR_STOP: Final[int]
+    SNDCTL_TMR_TEMPO: Final[int]
+    SNDCTL_TMR_TIMEBASE: Final[int]
+    SOUND_MIXER_ALTPCM: Final[int]
+    SOUND_MIXER_BASS: Final[int]
+    SOUND_MIXER_CD: Final[int]
+    SOUND_MIXER_DIGITAL1: Final[int]
+    SOUND_MIXER_DIGITAL2: Final[int]
+    SOUND_MIXER_DIGITAL3: Final[int]
+    SOUND_MIXER_IGAIN: Final[int]
+    SOUND_MIXER_IMIX: Final[int]
+    SOUND_MIXER_LINE: Final[int]
+    SOUND_MIXER_LINE1: Final[int]
+    SOUND_MIXER_LINE2: Final[int]
+    SOUND_MIXER_LINE3: Final[int]
+    SOUND_MIXER_MIC: Final[int]
+    SOUND_MIXER_MONITOR: Final[int]
+    SOUND_MIXER_NRDEVICES: Final[int]
+    SOUND_MIXER_OGAIN: Final[int]
+    SOUND_MIXER_PCM: Final[int]
+    SOUND_MIXER_PHONEIN: Final[int]
+    SOUND_MIXER_PHONEOUT: Final[int]
+    SOUND_MIXER_RADIO: Final[int]
+    SOUND_MIXER_RECLEV: Final[int]
+    SOUND_MIXER_SPEAKER: Final[int]
+    SOUND_MIXER_SYNTH: Final[int]
+    SOUND_MIXER_TREBLE: Final[int]
+    SOUND_MIXER_VIDEO: Final[int]
+    SOUND_MIXER_VOLUME: Final[int]
 
     control_labels: list[str]
     control_names: list[str]
diff --git a/mypy/typeshed/stdlib/pathlib/__init__.pyi b/mypy/typeshed/stdlib/pathlib/__init__.pyi
index 4858f8db1ed0..fa5143f20292 100644
--- a/mypy/typeshed/stdlib/pathlib/__init__.pyi
+++ b/mypy/typeshed/stdlib/pathlib/__init__.pyi
@@ -29,6 +29,31 @@ if sys.version_info >= (3, 13):
     __all__ += ["UnsupportedOperation"]
 
 class PurePath(PathLike[str]):
+    if sys.version_info >= (3, 13):
+        __slots__ = (
+            "_raw_paths",
+            "_drv",
+            "_root",
+            "_tail_cached",
+            "_str",
+            "_str_normcase_cached",
+            "_parts_normcase_cached",
+            "_hash",
+        )
+    elif sys.version_info >= (3, 12):
+        __slots__ = (
+            "_raw_paths",
+            "_drv",
+            "_root",
+            "_tail_cached",
+            "_str",
+            "_str_normcase_cached",
+            "_parts_normcase_cached",
+            "_lines_cached",
+            "_hash",
+        )
+    else:
+        __slots__ = ("_drv", "_root", "_parts", "_str", "_hash", "_pparts", "_cached_cparts")
     if sys.version_info >= (3, 13):
         parser: ClassVar[types.ModuleType]
         def full_match(self, pattern: StrPath, *, case_sensitive: bool | None = None) -> bool: ...
@@ -108,10 +133,20 @@ class PurePath(PathLike[str]):
     if sys.version_info >= (3, 12):
         def with_segments(self, *args: StrPath) -> Self: ...
 
-class PurePosixPath(PurePath): ...
-class PureWindowsPath(PurePath): ...
+class PurePosixPath(PurePath):
+    __slots__ = ()
+
+class PureWindowsPath(PurePath):
+    __slots__ = ()
 
 class Path(PurePath):
+    if sys.version_info >= (3, 14):
+        __slots__ = ("_info",)
+    elif sys.version_info >= (3, 10):
+        __slots__ = ()
+    else:
+        __slots__ = ("_accessor",)
+
     if sys.version_info >= (3, 12):
         def __new__(cls, *args: StrPath, **kwargs: Unused) -> Self: ...  # pyright: ignore[reportInconsistentConstructor]
     else:
@@ -307,11 +342,14 @@ class Path(PurePath):
             def link_to(self, target: StrOrBytesPath) -> None: ...
     if sys.version_info >= (3, 12):
         def walk(
-            self, top_down: bool = ..., on_error: Callable[[OSError], object] | None = ..., follow_symlinks: bool = ...
+            self, top_down: bool = True, on_error: Callable[[OSError], object] | None = None, follow_symlinks: bool = False
         ) -> Iterator[tuple[Self, list[str], list[str]]]: ...
 
-class PosixPath(Path, PurePosixPath): ...
-class WindowsPath(Path, PureWindowsPath): ...
+class PosixPath(Path, PurePosixPath):
+    __slots__ = ()
+
+class WindowsPath(Path, PureWindowsPath):
+    __slots__ = ()
 
 if sys.version_info >= (3, 13):
     class UnsupportedOperation(NotImplementedError): ...
diff --git a/mypy/typeshed/stdlib/pdb.pyi b/mypy/typeshed/stdlib/pdb.pyi
index ad69fcab16de..0c16f48e2e22 100644
--- a/mypy/typeshed/stdlib/pdb.pyi
+++ b/mypy/typeshed/stdlib/pdb.pyi
@@ -17,7 +17,7 @@ _T = TypeVar("_T")
 _P = ParamSpec("_P")
 _Mode: TypeAlias = Literal["inline", "cli"]
 
-line_prefix: str  # undocumented
+line_prefix: Final[str]  # undocumented
 
 class Restart(Exception): ...
 
@@ -131,7 +131,11 @@ class Pdb(Bdb, Cmd):
         def completedefault(self, text: str, line: str, begidx: int, endidx: int) -> list[str]: ...
 
     def do_commands(self, arg: str) -> bool | None: ...
-    def do_break(self, arg: str, temporary: bool = ...) -> bool | None: ...
+    if sys.version_info >= (3, 14):
+        def do_break(self, arg: str, temporary: bool = False) -> bool | None: ...
+    else:
+        def do_break(self, arg: str, temporary: bool | Literal[0, 1] = 0) -> bool | None: ...
+
     def do_tbreak(self, arg: str) -> bool | None: ...
     def do_enable(self, arg: str) -> bool | None: ...
     def do_disable(self, arg: str) -> bool | None: ...
diff --git a/mypy/typeshed/stdlib/pickle.pyi b/mypy/typeshed/stdlib/pickle.pyi
index 2d80d61645e0..d94fe208f446 100644
--- a/mypy/typeshed/stdlib/pickle.pyi
+++ b/mypy/typeshed/stdlib/pickle.pyi
@@ -14,7 +14,7 @@ from _pickle import (
 )
 from _typeshed import ReadableBuffer, SupportsWrite
 from collections.abc import Callable, Iterable, Mapping
-from typing import Any, ClassVar, SupportsBytes, SupportsIndex, final
+from typing import Any, ClassVar, Final, SupportsBytes, SupportsIndex, final
 from typing_extensions import Self
 
 __all__ = [
@@ -102,8 +102,8 @@ __all__ = [
     "UNICODE",
 ]
 
-HIGHEST_PROTOCOL: int
-DEFAULT_PROTOCOL: int
+HIGHEST_PROTOCOL: Final = 5
+DEFAULT_PROTOCOL: Final = 5
 
 bytes_types: tuple[type[Any], ...]  # undocumented
 
@@ -115,85 +115,85 @@ class PickleBuffer:
     def __buffer__(self, flags: int, /) -> memoryview: ...
     def __release_buffer__(self, buffer: memoryview, /) -> None: ...
 
-MARK: bytes
-STOP: bytes
-POP: bytes
-POP_MARK: bytes
-DUP: bytes
-FLOAT: bytes
-INT: bytes
-BININT: bytes
-BININT1: bytes
-LONG: bytes
-BININT2: bytes
-NONE: bytes
-PERSID: bytes
-BINPERSID: bytes
-REDUCE: bytes
-STRING: bytes
-BINSTRING: bytes
-SHORT_BINSTRING: bytes
-UNICODE: bytes
-BINUNICODE: bytes
-APPEND: bytes
-BUILD: bytes
-GLOBAL: bytes
-DICT: bytes
-EMPTY_DICT: bytes
-APPENDS: bytes
-GET: bytes
-BINGET: bytes
-INST: bytes
-LONG_BINGET: bytes
-LIST: bytes
-EMPTY_LIST: bytes
-OBJ: bytes
-PUT: bytes
-BINPUT: bytes
-LONG_BINPUT: bytes
-SETITEM: bytes
-TUPLE: bytes
-EMPTY_TUPLE: bytes
-SETITEMS: bytes
-BINFLOAT: bytes
+MARK: Final = b"("
+STOP: Final = b"."
+POP: Final = b"0"
+POP_MARK: Final = b"1"
+DUP: Final = b"2"
+FLOAT: Final = b"F"
+INT: Final = b"I"
+BININT: Final = b"J"
+BININT1: Final = b"K"
+LONG: Final = b"L"
+BININT2: Final = b"M"
+NONE: Final = b"N"
+PERSID: Final = b"P"
+BINPERSID: Final = b"Q"
+REDUCE: Final = b"R"
+STRING: Final = b"S"
+BINSTRING: Final = b"T"
+SHORT_BINSTRING: Final = b"U"
+UNICODE: Final = b"V"
+BINUNICODE: Final = b"X"
+APPEND: Final = b"a"
+BUILD: Final = b"b"
+GLOBAL: Final = b"c"
+DICT: Final = b"d"
+EMPTY_DICT: Final = b"}"
+APPENDS: Final = b"e"
+GET: Final = b"g"
+BINGET: Final = b"h"
+INST: Final = b"i"
+LONG_BINGET: Final = b"j"
+LIST: Final = b"l"
+EMPTY_LIST: Final = b"]"
+OBJ: Final = b"o"
+PUT: Final = b"p"
+BINPUT: Final = b"q"
+LONG_BINPUT: Final = b"r"
+SETITEM: Final = b"s"
+TUPLE: Final = b"t"
+EMPTY_TUPLE: Final = b")"
+SETITEMS: Final = b"u"
+BINFLOAT: Final = b"G"
 
-TRUE: bytes
-FALSE: bytes
+TRUE: Final = b"I01\n"
+FALSE: Final = b"I00\n"
 
 # protocol 2
-PROTO: bytes
-NEWOBJ: bytes
-EXT1: bytes
-EXT2: bytes
-EXT4: bytes
-TUPLE1: bytes
-TUPLE2: bytes
-TUPLE3: bytes
-NEWTRUE: bytes
-NEWFALSE: bytes
-LONG1: bytes
-LONG4: bytes
+PROTO: Final = b"\x80"
+NEWOBJ: Final = b"\x81"
+EXT1: Final = b"\x82"
+EXT2: Final = b"\x83"
+EXT4: Final = b"\x84"
+TUPLE1: Final = b"\x85"
+TUPLE2: Final = b"\x86"
+TUPLE3: Final = b"\x87"
+NEWTRUE: Final = b"\x88"
+NEWFALSE: Final = b"\x89"
+LONG1: Final = b"\x8a"
+LONG4: Final = b"\x8b"
 
 # protocol 3
-BINBYTES: bytes
-SHORT_BINBYTES: bytes
+BINBYTES: Final = b"B"
+SHORT_BINBYTES: Final = b"C"
 
 # protocol 4
-SHORT_BINUNICODE: bytes
-BINUNICODE8: bytes
-BINBYTES8: bytes
-EMPTY_SET: bytes
-ADDITEMS: bytes
-FROZENSET: bytes
-NEWOBJ_EX: bytes
-STACK_GLOBAL: bytes
-MEMOIZE: bytes
-FRAME: bytes
+SHORT_BINUNICODE: Final = b"\x8c"
+BINUNICODE8: Final = b"\x8d"
+BINBYTES8: Final = b"\x8e"
+EMPTY_SET: Final = b"\x8f"
+ADDITEMS: Final = b"\x90"
+FROZENSET: Final = b"\x91"
+NEWOBJ_EX: Final = b"\x92"
+STACK_GLOBAL: Final = b"\x93"
+MEMOIZE: Final = b"\x94"
+FRAME: Final = b"\x95"
 
 # protocol 5
-BYTEARRAY8: bytes
-NEXT_BUFFER: bytes
-READONLY_BUFFER: bytes
+BYTEARRAY8: Final = b"\x96"
+NEXT_BUFFER: Final = b"\x97"
+READONLY_BUFFER: Final = b"\x98"
 
 def encode_long(x: int) -> bytes: ...  # undocumented
 def decode_long(data: Iterable[SupportsIndex] | SupportsBytes | ReadableBuffer) -> int: ...  # undocumented
diff --git a/mypy/typeshed/stdlib/pickletools.pyi b/mypy/typeshed/stdlib/pickletools.pyi
index cdade08d39a8..8bbfaba31b67 100644
--- a/mypy/typeshed/stdlib/pickletools.pyi
+++ b/mypy/typeshed/stdlib/pickletools.pyi
@@ -1,6 +1,6 @@
 import sys
 from collections.abc import Callable, Iterator, MutableMapping
-from typing import IO, Any
+from typing import IO, Any, Final
 from typing_extensions import TypeAlias
 
 __all__ = ["dis", "genops", "optimize"]
@@ -8,13 +8,14 @@ __all__ = ["dis", "genops", "optimize"]
 _Reader: TypeAlias = Callable[[IO[bytes]], Any]
 bytes_types: tuple[type[Any], ...]
 
-UP_TO_NEWLINE: int
-TAKEN_FROM_ARGUMENT1: int
-TAKEN_FROM_ARGUMENT4: int
-TAKEN_FROM_ARGUMENT4U: int
-TAKEN_FROM_ARGUMENT8U: int
+UP_TO_NEWLINE: Final = -1
+TAKEN_FROM_ARGUMENT1: Final = -2
+TAKEN_FROM_ARGUMENT4: Final = -3
+TAKEN_FROM_ARGUMENT4U: Final = -4
+TAKEN_FROM_ARGUMENT8U: Final = -5
 
 class ArgumentDescriptor:
+    __slots__ = ("name", "n", "reader", "doc")
     name: str
     n: int
     reader: _Reader
@@ -118,6 +119,7 @@ def read_long4(f: IO[bytes]) -> int: ...
 long4: ArgumentDescriptor
 
 class StackObject:
+    __slots__ = ("name", "obtype", "doc")
     name: str
     obtype: type[Any] | tuple[type[Any], ...]
     doc: str
@@ -143,6 +145,7 @@ markobject: StackObject
 stackslice: StackObject
 
 class OpcodeInfo:
+    __slots__ = ("name", "code", "arg", "stack_before", "stack_after", "proto", "doc")
     name: str
     code: str
     arg: ArgumentDescriptor | None
diff --git a/mypy/typeshed/stdlib/platform.pyi b/mypy/typeshed/stdlib/platform.pyi
index c6125bd3a56f..69d702bb155c 100644
--- a/mypy/typeshed/stdlib/platform.pyi
+++ b/mypy/typeshed/stdlib/platform.pyi
@@ -1,6 +1,6 @@
 import sys
 from typing import NamedTuple, type_check_only
-from typing_extensions import Self, deprecated
+from typing_extensions import Self, deprecated, disjoint_base
 
 def libc_ver(executable: str | None = None, lib: str = "", version: str = "", chunksize: int = 16384) -> tuple[str, str]: ...
 def win32_ver(release: str = "", version: str = "", csd: str = "", ptype: str = "") -> tuple[str, str, str, str]: ...
@@ -46,13 +46,23 @@ class _uname_result_base(NamedTuple):
 
 # uname_result emulates a 6-field named tuple, but the processor field
 # is lazily evaluated rather than being passed in to the constructor.
-class uname_result(_uname_result_base):
-    if sys.version_info >= (3, 10):
+if sys.version_info >= (3, 12):
+    class uname_result(_uname_result_base):
         __match_args__ = ("system", "node", "release", "version", "machine")  # pyright: ignore[reportAssignmentType]
 
-    def __new__(_cls, system: str, node: str, release: str, version: str, machine: str) -> Self: ...
-    @property
-    def processor(self) -> str: ...
+        def __new__(_cls, system: str, node: str, release: str, version: str, machine: str) -> Self: ...
+        @property
+        def processor(self) -> str: ...
+
+else:
+    @disjoint_base
+    class uname_result(_uname_result_base):
+        if sys.version_info >= (3, 10):
+            __match_args__ = ("system", "node", "release", "version", "machine")  # pyright: ignore[reportAssignmentType]
+
+        def __new__(_cls, system: str, node: str, release: str, version: str, machine: str) -> Self: ...
+        @property
+        def processor(self) -> str: ...
 
 def uname() -> uname_result: ...
 def system() -> str: ...
@@ -68,7 +78,7 @@ def python_branch() -> str: ...
 def python_revision() -> str: ...
 def python_build() -> tuple[str, str]: ...
 def python_compiler() -> str: ...
-def platform(aliased: bool = ..., terse: bool = ...) -> str: ...
+def platform(aliased: bool = False, terse: bool = False) -> str: ...
 
 if sys.version_info >= (3, 10):
     def freedesktop_os_release() -> dict[str, str]: ...
diff --git a/mypy/typeshed/stdlib/plistlib.pyi b/mypy/typeshed/stdlib/plistlib.pyi
index 8b39b4217eae..dc3247ee47fb 100644
--- a/mypy/typeshed/stdlib/plistlib.pyi
+++ b/mypy/typeshed/stdlib/plistlib.pyi
@@ -3,7 +3,7 @@ from _typeshed import ReadableBuffer
 from collections.abc import Mapping, MutableMapping
 from datetime import datetime
 from enum import Enum
-from typing import IO, Any
+from typing import IO, Any, Final
 from typing_extensions import Self
 
 __all__ = ["InvalidFileException", "FMT_XML", "FMT_BINARY", "load", "dump", "loads", "dumps", "UID"]
@@ -12,8 +12,8 @@ class PlistFormat(Enum):
     FMT_XML = 1
     FMT_BINARY = 2
 
-FMT_XML = PlistFormat.FMT_XML
-FMT_BINARY = PlistFormat.FMT_BINARY
+FMT_XML: Final = PlistFormat.FMT_XML
+FMT_BINARY: Final = PlistFormat.FMT_BINARY
 if sys.version_info >= (3, 13):
     def load(
         fp: IO[bytes],
diff --git a/mypy/typeshed/stdlib/poplib.pyi b/mypy/typeshed/stdlib/poplib.pyi
index a1e41be86a7f..9ff2b764aeb6 100644
--- a/mypy/typeshed/stdlib/poplib.pyi
+++ b/mypy/typeshed/stdlib/poplib.pyi
@@ -17,7 +17,7 @@ POP3_SSL_PORT: Final = 995
 CR: Final = b"\r"
 LF: Final = b"\n"
 CRLF: Final = b"\r\n"
-HAVE_SSL: bool
+HAVE_SSL: Final[bool]
 
 class POP3:
     encoding: str
diff --git a/mypy/typeshed/stdlib/pydoc.pyi b/mypy/typeshed/stdlib/pydoc.pyi
index 3c78f9d2de8e..935f9420f88c 100644
--- a/mypy/typeshed/stdlib/pydoc.pyi
+++ b/mypy/typeshed/stdlib/pydoc.pyi
@@ -34,11 +34,11 @@ def visiblename(name: str, all: Container[str] | None = None, obj: object = None
 def classify_class_attrs(object: object) -> list[tuple[str, str, type, str]]: ...
 
 if sys.version_info >= (3, 13):
-    @deprecated("Deprecated in Python 3.13.")
-    def ispackage(path: str) -> bool: ...
+    @deprecated("Deprecated since Python 3.13.")
+    def ispackage(path: str) -> bool: ...  # undocumented
 
 else:
-    def ispackage(path: str) -> bool: ...
+    def ispackage(path: str) -> bool: ...  # undocumented
 
 def source_synopsis(file: IO[AnyStr]) -> AnyStr | None: ...
 def synopsis(filename: str, cache: MutableMapping[str, tuple[int, str]] = {}) -> str | None: ...
diff --git a/mypy/typeshed/stdlib/pydoc_data/topics.pyi b/mypy/typeshed/stdlib/pydoc_data/topics.pyi
index 091d34300106..ce907a41c005 100644
--- a/mypy/typeshed/stdlib/pydoc_data/topics.pyi
+++ b/mypy/typeshed/stdlib/pydoc_data/topics.pyi
@@ -1 +1,3 @@
-topics: dict[str, str]
+from typing import Final
+
+topics: Final[dict[str, str]]
diff --git a/mypy/typeshed/stdlib/random.pyi b/mypy/typeshed/stdlib/random.pyi
index 83e37113a941..a797794b8050 100644
--- a/mypy/typeshed/stdlib/random.pyi
+++ b/mypy/typeshed/stdlib/random.pyi
@@ -4,6 +4,7 @@ from _typeshed import SupportsLenAndGetItem
 from collections.abc import Callable, Iterable, MutableSequence, Sequence, Set as AbstractSet
 from fractions import Fraction
 from typing import Any, ClassVar, NoReturn, TypeVar
+from typing_extensions import Self
 
 __all__ = [
     "Random",
@@ -44,6 +45,10 @@ class Random(_random.Random):
     # Using other `seed` types is deprecated since 3.9 and removed in 3.11
     # Ignore Y041, since random.seed doesn't treat int like a float subtype. Having an explicit
     # int better documents conventional usage of random.seed.
+    if sys.version_info < (3, 10):
+        # this is a workaround for pyright correctly flagging an inconsistent inherited constructor, see #14624
+        def __new__(cls, x: int | float | str | bytes | bytearray | None = None) -> Self: ...  # noqa: Y041
+
     def seed(self, a: int | float | str | bytes | bytearray | None = None, version: int = 2) -> None: ...  # type: ignore[override]  # noqa: Y041
     def getstate(self) -> tuple[Any, ...]: ...
     def setstate(self, state: tuple[Any, ...]) -> None: ...
diff --git a/mypy/typeshed/stdlib/resource.pyi b/mypy/typeshed/stdlib/resource.pyi
index 5e468c2cead5..f99cd5b08805 100644
--- a/mypy/typeshed/stdlib/resource.pyi
+++ b/mypy/typeshed/stdlib/resource.pyi
@@ -3,27 +3,28 @@ from _typeshed import structseq
 from typing import Final, final
 
 if sys.platform != "win32":
-    RLIMIT_AS: int
-    RLIMIT_CORE: int
-    RLIMIT_CPU: int
-    RLIMIT_DATA: int
-    RLIMIT_FSIZE: int
-    RLIMIT_MEMLOCK: int
-    RLIMIT_NOFILE: int
-    RLIMIT_NPROC: int
-    RLIMIT_RSS: int
-    RLIMIT_STACK: int
-    RLIM_INFINITY: int
-    RUSAGE_CHILDREN: int
-    RUSAGE_SELF: int
+    # Depends on resource.h
+    RLIMIT_AS: Final[int]
+    RLIMIT_CORE: Final[int]
+    RLIMIT_CPU: Final[int]
+    RLIMIT_DATA: Final[int]
+    RLIMIT_FSIZE: Final[int]
+    RLIMIT_MEMLOCK: Final[int]
+    RLIMIT_NOFILE: Final[int]
+    RLIMIT_NPROC: Final[int]
+    RLIMIT_RSS: Final[int]
+    RLIMIT_STACK: Final[int]
+    RLIM_INFINITY: Final[int]
+    RUSAGE_CHILDREN: Final[int]
+    RUSAGE_SELF: Final[int]
     if sys.platform == "linux":
-        RLIMIT_MSGQUEUE: int
-        RLIMIT_NICE: int
-        RLIMIT_OFILE: int
-        RLIMIT_RTPRIO: int
-        RLIMIT_RTTIME: int
-        RLIMIT_SIGPENDING: int
-        RUSAGE_THREAD: int
+        RLIMIT_MSGQUEUE: Final[int]
+        RLIMIT_NICE: Final[int]
+        RLIMIT_OFILE: Final[int]
+        RLIMIT_RTPRIO: Final[int]
+        RLIMIT_RTTIME: Final[int]
+        RLIMIT_SIGPENDING: Final[int]
+        RUSAGE_THREAD: Final[int]
 
     @final
     class struct_rusage(
diff --git a/mypy/typeshed/stdlib/select.pyi b/mypy/typeshed/stdlib/select.pyi
index 023547390273..587bc75376ef 100644
--- a/mypy/typeshed/stdlib/select.pyi
+++ b/mypy/typeshed/stdlib/select.pyi
@@ -2,25 +2,25 @@ import sys
 from _typeshed import FileDescriptorLike
 from collections.abc import Iterable
 from types import TracebackType
-from typing import Any, ClassVar, final
+from typing import Any, ClassVar, Final, final
 from typing_extensions import Self
 
 if sys.platform != "win32":
-    PIPE_BUF: int
-    POLLERR: int
-    POLLHUP: int
-    POLLIN: int
+    PIPE_BUF: Final[int]
+    POLLERR: Final[int]
+    POLLHUP: Final[int]
+    POLLIN: Final[int]
     if sys.platform == "linux":
-        POLLMSG: int
-    POLLNVAL: int
-    POLLOUT: int
-    POLLPRI: int
-    POLLRDBAND: int
+        POLLMSG: Final[int]
+    POLLNVAL: Final[int]
+    POLLOUT: Final[int]
+    POLLPRI: Final[int]
+    POLLRDBAND: Final[int]
     if sys.platform == "linux":
-        POLLRDHUP: int
-    POLLRDNORM: int
-    POLLWRBAND: int
-    POLLWRNORM: int
+        POLLRDHUP: Final[int]
+    POLLRDNORM: Final[int]
+    POLLWRBAND: Final[int]
+    POLLWRNORM: Final[int]
 
     # This is actually a function that returns an instance of a class.
     # The class is not accessible directly, and also calls itself select.poll.
@@ -71,50 +71,50 @@ if sys.platform != "linux" and sys.platform != "win32":
         @classmethod
         def fromfd(cls, fd: FileDescriptorLike, /) -> kqueue: ...
 
-    KQ_EV_ADD: int
-    KQ_EV_CLEAR: int
-    KQ_EV_DELETE: int
-    KQ_EV_DISABLE: int
-    KQ_EV_ENABLE: int
-    KQ_EV_EOF: int
-    KQ_EV_ERROR: int
-    KQ_EV_FLAG1: int
-    KQ_EV_ONESHOT: int
-    KQ_EV_SYSFLAGS: int
-    KQ_FILTER_AIO: int
+    KQ_EV_ADD: Final[int]
+    KQ_EV_CLEAR: Final[int]
+    KQ_EV_DELETE: Final[int]
+    KQ_EV_DISABLE: Final[int]
+    KQ_EV_ENABLE: Final[int]
+    KQ_EV_EOF: Final[int]
+    KQ_EV_ERROR: Final[int]
+    KQ_EV_FLAG1: Final[int]
+    KQ_EV_ONESHOT: Final[int]
+    KQ_EV_SYSFLAGS: Final[int]
+    KQ_FILTER_AIO: Final[int]
     if sys.platform != "darwin":
-        KQ_FILTER_NETDEV: int
-    KQ_FILTER_PROC: int
-    KQ_FILTER_READ: int
-    KQ_FILTER_SIGNAL: int
-    KQ_FILTER_TIMER: int
-    KQ_FILTER_VNODE: int
-    KQ_FILTER_WRITE: int
-    KQ_NOTE_ATTRIB: int
-    KQ_NOTE_CHILD: int
-    KQ_NOTE_DELETE: int
-    KQ_NOTE_EXEC: int
-    KQ_NOTE_EXIT: int
-    KQ_NOTE_EXTEND: int
-    KQ_NOTE_FORK: int
-    KQ_NOTE_LINK: int
+        KQ_FILTER_NETDEV: Final[int]
+    KQ_FILTER_PROC: Final[int]
+    KQ_FILTER_READ: Final[int]
+    KQ_FILTER_SIGNAL: Final[int]
+    KQ_FILTER_TIMER: Final[int]
+    KQ_FILTER_VNODE: Final[int]
+    KQ_FILTER_WRITE: Final[int]
+    KQ_NOTE_ATTRIB: Final[int]
+    KQ_NOTE_CHILD: Final[int]
+    KQ_NOTE_DELETE: Final[int]
+    KQ_NOTE_EXEC: Final[int]
+    KQ_NOTE_EXIT: Final[int]
+    KQ_NOTE_EXTEND: Final[int]
+    KQ_NOTE_FORK: Final[int]
+    KQ_NOTE_LINK: Final[int]
     if sys.platform != "darwin":
-        KQ_NOTE_LINKDOWN: int
-        KQ_NOTE_LINKINV: int
-        KQ_NOTE_LINKUP: int
-    KQ_NOTE_LOWAT: int
-    KQ_NOTE_PCTRLMASK: int
-    KQ_NOTE_PDATAMASK: int
-    KQ_NOTE_RENAME: int
-    KQ_NOTE_REVOKE: int
-    KQ_NOTE_TRACK: int
-    KQ_NOTE_TRACKERR: int
-    KQ_NOTE_WRITE: int
+        KQ_NOTE_LINKDOWN: Final[int]
+        KQ_NOTE_LINKINV: Final[int]
+        KQ_NOTE_LINKUP: Final[int]
+    KQ_NOTE_LOWAT: Final[int]
+    KQ_NOTE_PCTRLMASK: Final[int]
+    KQ_NOTE_PDATAMASK: Final[int]
+    KQ_NOTE_RENAME: Final[int]
+    KQ_NOTE_REVOKE: Final[int]
+    KQ_NOTE_TRACK: Final[int]
+    KQ_NOTE_TRACKERR: Final[int]
+    KQ_NOTE_WRITE: Final[int]
 
 if sys.platform == "linux":
     @final
     class epoll:
-        def __init__(self, sizehint: int = ..., flags: int = ...) -> None: ...
+        def __new__(self, sizehint: int = ..., flags: int = ...) -> Self: ...
         def __enter__(self) -> Self: ...
         def __exit__(
             self,
@@ -133,23 +133,23 @@ if sys.platform == "linux":
         @classmethod
         def fromfd(cls, fd: FileDescriptorLike, /) -> epoll: ...
 
-    EPOLLERR: int
-    EPOLLEXCLUSIVE: int
-    EPOLLET: int
-    EPOLLHUP: int
-    EPOLLIN: int
-    EPOLLMSG: int
-    EPOLLONESHOT: int
-    EPOLLOUT: int
-    EPOLLPRI: int
-    EPOLLRDBAND: int
-    EPOLLRDHUP: int
-    EPOLLRDNORM: int
-    EPOLLWRBAND: int
-    EPOLLWRNORM: int
-    EPOLL_CLOEXEC: int
+    EPOLLERR: Final[int]
+    EPOLLEXCLUSIVE: Final[int]
+    EPOLLET: Final[int]
+    EPOLLHUP: Final[int]
+    EPOLLIN: Final[int]
+    EPOLLMSG: Final[int]
+    EPOLLONESHOT: Final[int]
+    EPOLLOUT: Final[int]
+    EPOLLPRI: Final[int]
+    EPOLLRDBAND: Final[int]
+    EPOLLRDHUP: Final[int]
+    EPOLLRDNORM: Final[int]
+    EPOLLWRBAND: Final[int]
+    EPOLLWRNORM: Final[int]
+    EPOLL_CLOEXEC: Final[int]
     if sys.version_info >= (3, 14):
-        EPOLLWAKEUP: int
+        EPOLLWAKEUP: Final[int]
 
 if sys.platform != "linux" and sys.platform != "darwin" and sys.platform != "win32":
     # Solaris only
diff --git a/mypy/typeshed/stdlib/selectors.pyi b/mypy/typeshed/stdlib/selectors.pyi
index 0ba843a403d8..bcca4e341b9a 100644
--- a/mypy/typeshed/stdlib/selectors.pyi
+++ b/mypy/typeshed/stdlib/selectors.pyi
@@ -2,13 +2,13 @@ import sys
 from _typeshed import FileDescriptor, FileDescriptorLike, Unused
 from abc import ABCMeta, abstractmethod
 from collections.abc import Mapping
-from typing import Any, NamedTuple
+from typing import Any, Final, NamedTuple
 from typing_extensions import Self, TypeAlias
 
 _EventMask: TypeAlias = int
 
-EVENT_READ: _EventMask
-EVENT_WRITE: _EventMask
+EVENT_READ: Final = 1
+EVENT_WRITE: Final = 2
 
 class SelectorKey(NamedTuple):
     fileobj: FileDescriptorLike
diff --git a/mypy/typeshed/stdlib/smtplib.pyi b/mypy/typeshed/stdlib/smtplib.pyi
index 3d392c047993..6a8467689367 100644
--- a/mypy/typeshed/stdlib/smtplib.pyi
+++ b/mypy/typeshed/stdlib/smtplib.pyi
@@ -7,7 +7,7 @@ from re import Pattern
 from socket import socket
 from ssl import SSLContext
 from types import TracebackType
-from typing import Any, Protocol, overload, type_check_only
+from typing import Any, Final, Protocol, overload, type_check_only
 from typing_extensions import Self, TypeAlias
 
 __all__ = [
@@ -30,12 +30,12 @@ __all__ = [
 _Reply: TypeAlias = tuple[int, bytes]
 _SendErrs: TypeAlias = dict[str, _Reply]
 
-SMTP_PORT: int
-SMTP_SSL_PORT: int
-CRLF: str
-bCRLF: bytes
+SMTP_PORT: Final = 25
+SMTP_SSL_PORT: Final = 465
+CRLF: Final[str]
+bCRLF: Final[bytes]
 
-OLDSTYLE_AUTH: Pattern[str]
+OLDSTYLE_AUTH: Final[Pattern[str]]
 
 class SMTPException(OSError): ...
 class SMTPNotSupportedError(SMTPException): ...
@@ -182,7 +182,7 @@ class SMTP_SSL(SMTP):
             context: SSLContext | None = None,
         ) -> None: ...
 
-LMTP_PORT: int
+LMTP_PORT: Final = 2003
 
 class LMTP(SMTP):
     def __init__(
diff --git a/mypy/typeshed/stdlib/socket.pyi b/mypy/typeshed/stdlib/socket.pyi
index d62f4c228151..b10b3560b91f 100644
--- a/mypy/typeshed/stdlib/socket.pyi
+++ b/mypy/typeshed/stdlib/socket.pyi
@@ -136,7 +136,7 @@ from _typeshed import ReadableBuffer, Unused, WriteableBuffer
 from collections.abc import Iterable
 from enum import IntEnum, IntFlag
 from io import BufferedReader, BufferedRWPair, BufferedWriter, IOBase, RawIOBase, TextIOWrapper
-from typing import Any, Literal, Protocol, SupportsIndex, overload, type_check_only
+from typing import Any, Final, Literal, Protocol, SupportsIndex, overload, type_check_only
 from typing_extensions import Self
 
 __all__ = [
@@ -1059,9 +1059,9 @@ if sys.version_info >= (3, 14):
         __all__ += ["IP_FREEBIND", "IP_RECVORIGDSTADDR", "VMADDR_CID_LOCAL"]
 
 # Re-exported from errno
-EBADF: int
-EAGAIN: int
-EWOULDBLOCK: int
+EBADF: Final[int]
+EAGAIN: Final[int]
+EWOULDBLOCK: Final[int]
 
 # These errors are implemented in _socket at runtime
 # but they consider themselves to live in socket so we'll put them here.
@@ -1124,60 +1124,60 @@ class AddressFamily(IntEnum):
         # FreeBSD >= 14.0
         AF_DIVERT = 44
 
-AF_INET = AddressFamily.AF_INET
-AF_INET6 = AddressFamily.AF_INET6
-AF_APPLETALK = AddressFamily.AF_APPLETALK
-AF_DECnet: Literal[12]
-AF_IPX = AddressFamily.AF_IPX
-AF_SNA = AddressFamily.AF_SNA
-AF_UNSPEC = AddressFamily.AF_UNSPEC
+AF_INET: Final = AddressFamily.AF_INET
+AF_INET6: Final = AddressFamily.AF_INET6
+AF_APPLETALK: Final = AddressFamily.AF_APPLETALK
+AF_DECnet: Final = 12
+AF_IPX: Final = AddressFamily.AF_IPX
+AF_SNA: Final = AddressFamily.AF_SNA
+AF_UNSPEC: Final = AddressFamily.AF_UNSPEC
 
 if sys.platform != "darwin":
-    AF_IRDA = AddressFamily.AF_IRDA
+    AF_IRDA: Final = AddressFamily.AF_IRDA
 
 if sys.platform != "win32":
-    AF_ROUTE = AddressFamily.AF_ROUTE
-    AF_UNIX = AddressFamily.AF_UNIX
+    AF_ROUTE: Final = AddressFamily.AF_ROUTE
+    AF_UNIX: Final = AddressFamily.AF_UNIX
 
 if sys.platform == "darwin":
-    AF_SYSTEM = AddressFamily.AF_SYSTEM
+    AF_SYSTEM: Final = AddressFamily.AF_SYSTEM
 
 if sys.platform != "win32" and sys.platform != "darwin":
-    AF_ASH = AddressFamily.AF_ASH
-    AF_ATMPVC = AddressFamily.AF_ATMPVC
-    AF_ATMSVC = AddressFamily.AF_ATMSVC
-    AF_AX25 = AddressFamily.AF_AX25
-    AF_BRIDGE = AddressFamily.AF_BRIDGE
-    AF_ECONET = AddressFamily.AF_ECONET
-    AF_KEY = AddressFamily.AF_KEY
-    AF_LLC = AddressFamily.AF_LLC
-    AF_NETBEUI = AddressFamily.AF_NETBEUI
-    AF_NETROM = AddressFamily.AF_NETROM
-    AF_PPPOX = AddressFamily.AF_PPPOX
-    AF_ROSE = AddressFamily.AF_ROSE
-    AF_SECURITY = AddressFamily.AF_SECURITY
-    AF_WANPIPE = AddressFamily.AF_WANPIPE
-    AF_X25 = AddressFamily.AF_X25
+    AF_ASH: Final = AddressFamily.AF_ASH
+    AF_ATMPVC: Final = AddressFamily.AF_ATMPVC
+    AF_ATMSVC: Final = AddressFamily.AF_ATMSVC
+    AF_AX25: Final = AddressFamily.AF_AX25
+    AF_BRIDGE: Final = AddressFamily.AF_BRIDGE
+    AF_ECONET: Final = AddressFamily.AF_ECONET
+    AF_KEY: Final = AddressFamily.AF_KEY
+    AF_LLC: Final = AddressFamily.AF_LLC
+    AF_NETBEUI: Final = AddressFamily.AF_NETBEUI
+    AF_NETROM: Final = AddressFamily.AF_NETROM
+    AF_PPPOX: Final = AddressFamily.AF_PPPOX
+    AF_ROSE: Final = AddressFamily.AF_ROSE
+    AF_SECURITY: Final = AddressFamily.AF_SECURITY
+    AF_WANPIPE: Final = AddressFamily.AF_WANPIPE
+    AF_X25: Final = AddressFamily.AF_X25
 
 if sys.platform == "linux":
-    AF_CAN = AddressFamily.AF_CAN
-    AF_PACKET = AddressFamily.AF_PACKET
-    AF_RDS = AddressFamily.AF_RDS
-    AF_TIPC = AddressFamily.AF_TIPC
-    AF_ALG = AddressFamily.AF_ALG
-    AF_NETLINK = AddressFamily.AF_NETLINK
-    AF_VSOCK = AddressFamily.AF_VSOCK
-    AF_QIPCRTR = AddressFamily.AF_QIPCRTR
+    AF_CAN: Final = AddressFamily.AF_CAN
+    AF_PACKET: Final = AddressFamily.AF_PACKET
+    AF_RDS: Final = AddressFamily.AF_RDS
+    AF_TIPC: Final = AddressFamily.AF_TIPC
+    AF_ALG: Final = AddressFamily.AF_ALG
+    AF_NETLINK: Final = AddressFamily.AF_NETLINK
+    AF_VSOCK: Final = AddressFamily.AF_VSOCK
+    AF_QIPCRTR: Final = AddressFamily.AF_QIPCRTR
 
 if sys.platform != "linux":
-    AF_LINK = AddressFamily.AF_LINK
+    AF_LINK: Final = AddressFamily.AF_LINK
 if sys.platform != "darwin" and sys.platform != "linux":
-    AF_BLUETOOTH = AddressFamily.AF_BLUETOOTH
+    AF_BLUETOOTH: Final = AddressFamily.AF_BLUETOOTH
 if sys.platform == "win32" and sys.version_info >= (3, 12):
-    AF_HYPERV = AddressFamily.AF_HYPERV
+    AF_HYPERV: Final = AddressFamily.AF_HYPERV
 if sys.platform != "linux" and sys.platform != "win32" and sys.platform != "darwin" and sys.version_info >= (3, 12):
     # FreeBSD >= 14.0
-    AF_DIVERT = AddressFamily.AF_DIVERT
+    AF_DIVERT: Final = AddressFamily.AF_DIVERT
 
 class SocketKind(IntEnum):
     SOCK_STREAM = 1
@@ -1189,14 +1189,14 @@ class SocketKind(IntEnum):
         SOCK_CLOEXEC = 524288
         SOCK_NONBLOCK = 2048
 
-SOCK_STREAM = SocketKind.SOCK_STREAM
-SOCK_DGRAM = SocketKind.SOCK_DGRAM
-SOCK_RAW = SocketKind.SOCK_RAW
-SOCK_RDM = SocketKind.SOCK_RDM
-SOCK_SEQPACKET = SocketKind.SOCK_SEQPACKET
+SOCK_STREAM: Final = SocketKind.SOCK_STREAM
+SOCK_DGRAM: Final = SocketKind.SOCK_DGRAM
+SOCK_RAW: Final = SocketKind.SOCK_RAW
+SOCK_RDM: Final = SocketKind.SOCK_RDM
+SOCK_SEQPACKET: Final = SocketKind.SOCK_SEQPACKET
 if sys.platform == "linux":
-    SOCK_CLOEXEC = SocketKind.SOCK_CLOEXEC
-    SOCK_NONBLOCK = SocketKind.SOCK_NONBLOCK
+    SOCK_CLOEXEC: Final = SocketKind.SOCK_CLOEXEC
+    SOCK_NONBLOCK: Final = SocketKind.SOCK_NONBLOCK
 
 class MsgFlag(IntFlag):
     MSG_CTRUNC = 8
@@ -1228,36 +1228,36 @@ class MsgFlag(IntFlag):
     if sys.platform != "win32" and sys.platform != "linux":
         MSG_EOF = 256
 
-MSG_CTRUNC = MsgFlag.MSG_CTRUNC
-MSG_DONTROUTE = MsgFlag.MSG_DONTROUTE
-MSG_OOB = MsgFlag.MSG_OOB
-MSG_PEEK = MsgFlag.MSG_PEEK
-MSG_TRUNC = MsgFlag.MSG_TRUNC
-MSG_WAITALL = MsgFlag.MSG_WAITALL
+MSG_CTRUNC: Final = MsgFlag.MSG_CTRUNC
+MSG_DONTROUTE: Final = MsgFlag.MSG_DONTROUTE
+MSG_OOB: Final = MsgFlag.MSG_OOB
+MSG_PEEK: Final = MsgFlag.MSG_PEEK
+MSG_TRUNC: Final = MsgFlag.MSG_TRUNC
+MSG_WAITALL: Final = MsgFlag.MSG_WAITALL
 
 if sys.platform == "win32":
-    MSG_BCAST = MsgFlag.MSG_BCAST
-    MSG_MCAST = MsgFlag.MSG_MCAST
+    MSG_BCAST: Final = MsgFlag.MSG_BCAST
+    MSG_MCAST: Final = MsgFlag.MSG_MCAST
 
 if sys.platform != "darwin":
-    MSG_ERRQUEUE = MsgFlag.MSG_ERRQUEUE
+    MSG_ERRQUEUE: Final = MsgFlag.MSG_ERRQUEUE
 
 if sys.platform != "win32":
-    MSG_DONTWAIT = MsgFlag.MSG_DONTWAIT
-    MSG_EOR = MsgFlag.MSG_EOR
-    MSG_NOSIGNAL = MsgFlag.MSG_NOSIGNAL  # Sometimes this exists on darwin, sometimes not
+    MSG_DONTWAIT: Final = MsgFlag.MSG_DONTWAIT
+    MSG_EOR: Final = MsgFlag.MSG_EOR
+    MSG_NOSIGNAL: Final = MsgFlag.MSG_NOSIGNAL  # Sometimes this exists on darwin, sometimes not
 
 if sys.platform != "win32" and sys.platform != "darwin":
-    MSG_CMSG_CLOEXEC = MsgFlag.MSG_CMSG_CLOEXEC
-    MSG_CONFIRM = MsgFlag.MSG_CONFIRM
-    MSG_FASTOPEN = MsgFlag.MSG_FASTOPEN
-    MSG_MORE = MsgFlag.MSG_MORE
+    MSG_CMSG_CLOEXEC: Final = MsgFlag.MSG_CMSG_CLOEXEC
+    MSG_CONFIRM: Final = MsgFlag.MSG_CONFIRM
+    MSG_FASTOPEN: Final = MsgFlag.MSG_FASTOPEN
+    MSG_MORE: Final = MsgFlag.MSG_MORE
 
 if sys.platform != "win32" and sys.platform != "darwin" and sys.platform != "linux":
-    MSG_NOTIFICATION = MsgFlag.MSG_NOTIFICATION
+    MSG_NOTIFICATION: Final = MsgFlag.MSG_NOTIFICATION
 
 if sys.platform != "win32" and sys.platform != "linux":
-    MSG_EOF = MsgFlag.MSG_EOF
+    MSG_EOF: Final = MsgFlag.MSG_EOF
 
 class AddressInfo(IntFlag):
     AI_ADDRCONFIG = 32
@@ -1272,18 +1272,18 @@ class AddressInfo(IntFlag):
         AI_MASK = 5127
         AI_V4MAPPED_CFG = 512
 
-AI_ADDRCONFIG = AddressInfo.AI_ADDRCONFIG
-AI_ALL = AddressInfo.AI_ALL
-AI_CANONNAME = AddressInfo.AI_CANONNAME
-AI_NUMERICHOST = AddressInfo.AI_NUMERICHOST
-AI_NUMERICSERV = AddressInfo.AI_NUMERICSERV
-AI_PASSIVE = AddressInfo.AI_PASSIVE
-AI_V4MAPPED = AddressInfo.AI_V4MAPPED
+AI_ADDRCONFIG: Final = AddressInfo.AI_ADDRCONFIG
+AI_ALL: Final = AddressInfo.AI_ALL
+AI_CANONNAME: Final = AddressInfo.AI_CANONNAME
+AI_NUMERICHOST: Final = AddressInfo.AI_NUMERICHOST
+AI_NUMERICSERV: Final = AddressInfo.AI_NUMERICSERV
+AI_PASSIVE: Final = AddressInfo.AI_PASSIVE
+AI_V4MAPPED: Final = AddressInfo.AI_V4MAPPED
 
 if sys.platform != "win32" and sys.platform != "linux":
-    AI_DEFAULT = AddressInfo.AI_DEFAULT
-    AI_MASK = AddressInfo.AI_MASK
-    AI_V4MAPPED_CFG = AddressInfo.AI_V4MAPPED_CFG
+    AI_DEFAULT: Final = AddressInfo.AI_DEFAULT
+    AI_MASK: Final = AddressInfo.AI_MASK
+    AI_V4MAPPED_CFG: Final = AddressInfo.AI_V4MAPPED_CFG
 
 if sys.platform == "win32":
     errorTab: dict[int, str]  # undocumented
@@ -1300,6 +1300,7 @@ class _SendableFile(Protocol):
     # def fileno(self) -> int: ...
 
 class socket(_socket.socket):
+    __slots__ = ["__weakref__", "_io_refs", "_closed"]
     def __init__(
         self, family: AddressFamily | int = -1, type: SocketKind | int = -1, proto: int = -1, fileno: int | None = None
     ) -> None: ...
diff --git a/mypy/typeshed/stdlib/sqlite3/__init__.pyi b/mypy/typeshed/stdlib/sqlite3/__init__.pyi
index 5a659deaccf6..882cd143c29c 100644
--- a/mypy/typeshed/stdlib/sqlite3/__init__.pyi
+++ b/mypy/typeshed/stdlib/sqlite3/__init__.pyi
@@ -63,7 +63,7 @@ from sqlite3.dbapi2 import (
 )
 from types import TracebackType
 from typing import Any, Literal, Protocol, SupportsIndex, TypeVar, final, overload, type_check_only
-from typing_extensions import Self, TypeAlias
+from typing_extensions import Self, TypeAlias, disjoint_base
 
 if sys.version_info < (3, 14):
     from sqlite3.dbapi2 import version_info as version_info
@@ -268,6 +268,7 @@ class OperationalError(DatabaseError): ...
 class ProgrammingError(DatabaseError): ...
 class Warning(Exception): ...
 
+@disjoint_base
 class Connection:
     @property
     def DataError(self) -> type[DataError]: ...
@@ -405,6 +406,7 @@ class Connection:
         self, type: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None, /
     ) -> Literal[False]: ...
 
+@disjoint_base
 class Cursor(Iterator[Any]):
     arraysize: int
     @property
@@ -436,6 +438,7 @@ class Cursor(Iterator[Any]):
 class PrepareProtocol:
     def __init__(self, *args: object, **kwargs: object) -> None: ...
 
+@disjoint_base
 class Row(Sequence[Any]):
     def __new__(cls, cursor: Cursor, data: tuple[Any, ...], /) -> Self: ...
     def keys(self) -> list[str]: ...
diff --git a/mypy/typeshed/stdlib/sqlite3/dbapi2.pyi b/mypy/typeshed/stdlib/sqlite3/dbapi2.pyi
index d37a0d391ec6..9e170a81243d 100644
--- a/mypy/typeshed/stdlib/sqlite3/dbapi2.pyi
+++ b/mypy/typeshed/stdlib/sqlite3/dbapi2.pyi
@@ -66,7 +66,8 @@ from sqlite3 import (
     Row as Row,
     Warning as Warning,
 )
-from typing import Literal
+from typing import Final, Literal
+from typing_extensions import deprecated
 
 if sys.version_info >= (3, 12):
     from _sqlite3 import (
@@ -211,11 +212,15 @@ if sys.version_info >= (3, 11):
 
 if sys.version_info < (3, 14):
     # Deprecated and removed from _sqlite3 in 3.12, but removed from here in 3.14.
-    version: str
+    version: Final[str]
 
 if sys.version_info < (3, 12):
     if sys.version_info >= (3, 10):
         # deprecation wrapper that has a different name for the argument...
+        @deprecated(
+            "Deprecated since Python 3.10; removed in Python 3.12. "
+            "Open database in URI mode using `cache=shared` parameter instead."
+        )
         def enable_shared_cache(enable: int) -> None: ...
     else:
         from _sqlite3 import enable_shared_cache as enable_shared_cache
@@ -223,9 +228,9 @@ if sys.version_info < (3, 12):
 if sys.version_info < (3, 10):
     from _sqlite3 import OptimizedUnicode as OptimizedUnicode
 
-paramstyle: str
+paramstyle: Final = "qmark"
 threadsafety: Literal[0, 1, 3]
-apilevel: str
+apilevel: Final[str]
 Date = date
 Time = time
 Timestamp = datetime
@@ -236,7 +241,7 @@ def TimestampFromTicks(ticks: float) -> Timestamp: ...
 
 if sys.version_info < (3, 14):
     # Deprecated in 3.12, removed in 3.14.
-    version_info: tuple[int, int, int]
+    version_info: Final[tuple[int, int, int]]
 
-sqlite_version_info: tuple[int, int, int]
+sqlite_version_info: Final[tuple[int, int, int]]
 Binary = memoryview
diff --git a/mypy/typeshed/stdlib/sre_compile.pyi b/mypy/typeshed/stdlib/sre_compile.pyi
index 2d04a886c931..d8f0b7937e99 100644
--- a/mypy/typeshed/stdlib/sre_compile.pyi
+++ b/mypy/typeshed/stdlib/sre_compile.pyi
@@ -2,9 +2,9 @@ from re import Pattern
 from sre_constants import *
 from sre_constants import _NamedIntConstant
 from sre_parse import SubPattern
-from typing import Any
+from typing import Any, Final
 
-MAXCODE: int
+MAXCODE: Final[int]
 
 def dis(code: list[_NamedIntConstant]) -> None: ...
 def isstring(obj: Any) -> bool: ...
diff --git a/mypy/typeshed/stdlib/sre_constants.pyi b/mypy/typeshed/stdlib/sre_constants.pyi
index a3921aa0fc3b..9a1da4ac89e7 100644
--- a/mypy/typeshed/stdlib/sre_constants.pyi
+++ b/mypy/typeshed/stdlib/sre_constants.pyi
@@ -1,15 +1,22 @@
 import sys
 from re import error as error
 from typing import Final
-from typing_extensions import Self
+from typing_extensions import Self, disjoint_base
 
 MAXGROUPS: Final[int]
 
 MAGIC: Final[int]
 
-class _NamedIntConstant(int):
-    name: str
-    def __new__(cls, value: int, name: str) -> Self: ...
+if sys.version_info >= (3, 12):
+    class _NamedIntConstant(int):
+        name: str
+        def __new__(cls, value: int, name: str) -> Self: ...
+
+else:
+    @disjoint_base
+    class _NamedIntConstant(int):
+        name: str
+        def __new__(cls, value: int, name: str) -> Self: ...
 
 MAXREPEAT: Final[_NamedIntConstant]
 OPCODES: list[_NamedIntConstant]
diff --git a/mypy/typeshed/stdlib/sre_parse.pyi b/mypy/typeshed/stdlib/sre_parse.pyi
index c242bd2a065f..eaacbff312a9 100644
--- a/mypy/typeshed/stdlib/sre_parse.pyi
+++ b/mypy/typeshed/stdlib/sre_parse.pyi
@@ -3,24 +3,24 @@ from collections.abc import Iterable
 from re import Match, Pattern as _Pattern
 from sre_constants import *
 from sre_constants import _NamedIntConstant as _NIC, error as _Error
-from typing import Any, overload
+from typing import Any, Final, overload
 from typing_extensions import TypeAlias
 
-SPECIAL_CHARS: str
-REPEAT_CHARS: str
-DIGITS: frozenset[str]
-OCTDIGITS: frozenset[str]
-HEXDIGITS: frozenset[str]
-ASCIILETTERS: frozenset[str]
-WHITESPACE: frozenset[str]
-ESCAPES: dict[str, tuple[_NIC, int]]
-CATEGORIES: dict[str, tuple[_NIC, _NIC] | tuple[_NIC, list[tuple[_NIC, _NIC]]]]
-FLAGS: dict[str, int]
-TYPE_FLAGS: int
-GLOBAL_FLAGS: int
+SPECIAL_CHARS: Final = ".\\[{()*+?^$|"
+REPEAT_CHARS: Final = "*+?{"
+DIGITS: Final[frozenset[str]]
+OCTDIGITS: Final[frozenset[str]]
+HEXDIGITS: Final[frozenset[str]]
+ASCIILETTERS: Final[frozenset[str]]
+WHITESPACE: Final[frozenset[str]]
+ESCAPES: Final[dict[str, tuple[_NIC, int]]]
+CATEGORIES: Final[dict[str, tuple[_NIC, _NIC] | tuple[_NIC, list[tuple[_NIC, _NIC]]]]]
+FLAGS: Final[dict[str, int]]
+TYPE_FLAGS: Final[int]
+GLOBAL_FLAGS: Final[int]
 
 if sys.version_info >= (3, 11):
-    MAXWIDTH: int
+    MAXWIDTH: Final[int]
 
 if sys.version_info < (3, 11):
     class Verbose(Exception): ...
@@ -39,7 +39,7 @@ class State:
     lookbehindgroups: int | None
     @property
     def groups(self) -> int: ...
-    def opengroup(self, name: str | None = ...) -> int: ...
+    def opengroup(self, name: str | None = None) -> int: ...
     def closegroup(self, gid: int, p: SubPattern) -> None: ...
     def checkgroup(self, gid: int) -> bool: ...
     def checklookbehindgroup(self, gid: int, source: Tokenizer) -> None: ...
diff --git a/mypy/typeshed/stdlib/ssl.pyi b/mypy/typeshed/stdlib/ssl.pyi
index f1893ec3194f..faa98cb39920 100644
--- a/mypy/typeshed/stdlib/ssl.pyi
+++ b/mypy/typeshed/stdlib/ssl.pyi
@@ -81,7 +81,7 @@ class SSLCertVerificationError(SSLError, ValueError):
 CertificateError = SSLCertVerificationError
 
 if sys.version_info < (3, 12):
-    @deprecated("Deprecated since Python 3.7. Removed in Python 3.12. Use `SSLContext.wrap_socket()` instead.")
+    @deprecated("Deprecated since Python 3.7; removed in Python 3.12. Use `SSLContext.wrap_socket()` instead.")
     def wrap_socket(
         sock: socket.socket,
         keyfile: StrOrBytesPath | None = None,
@@ -94,7 +94,7 @@ if sys.version_info < (3, 12):
         suppress_ragged_eofs: bool = True,
         ciphers: str | None = None,
     ) -> SSLSocket: ...
-    @deprecated("Deprecated since Python 3.7. Removed in Python 3.12.")
+    @deprecated("Deprecated since Python 3.7; removed in Python 3.12.")
     def match_hostname(cert: _PeerCertRetDictType, hostname: str) -> None: ...
 
 def cert_time_to_seconds(cert_time: str) -> int: ...
diff --git a/mypy/typeshed/stdlib/statistics.pyi b/mypy/typeshed/stdlib/statistics.pyi
index 6d7d3fbb4956..ba9e5f1b6b71 100644
--- a/mypy/typeshed/stdlib/statistics.pyi
+++ b/mypy/typeshed/stdlib/statistics.pyi
@@ -79,6 +79,7 @@ def stdev(data: Iterable[_NumberT], xbar: _NumberT | None = None) -> _NumberT: .
 def variance(data: Iterable[_NumberT], xbar: _NumberT | None = None) -> _NumberT: ...
 
 class NormalDist:
+    __slots__ = {"_mu": "Arithmetic mean of a normal distribution", "_sigma": "Standard deviation of a normal distribution"}
     def __init__(self, mu: float = 0.0, sigma: float = 1.0) -> None: ...
     @property
     def mean(self) -> float: ...
diff --git a/mypy/typeshed/stdlib/string/__init__.pyi b/mypy/typeshed/stdlib/string/__init__.pyi
index 29fe27f39b80..c8b32a98e26d 100644
--- a/mypy/typeshed/stdlib/string/__init__.pyi
+++ b/mypy/typeshed/stdlib/string/__init__.pyi
@@ -2,7 +2,7 @@ import sys
 from _typeshed import StrOrLiteralStr
 from collections.abc import Iterable, Mapping, Sequence
 from re import Pattern, RegexFlag
-from typing import Any, ClassVar, overload
+from typing import Any, ClassVar, Final, overload
 from typing_extensions import LiteralString
 
 __all__ = [
@@ -20,15 +20,15 @@ __all__ = [
     "Template",
 ]
 
-ascii_letters: LiteralString
-ascii_lowercase: LiteralString
-ascii_uppercase: LiteralString
-digits: LiteralString
-hexdigits: LiteralString
-octdigits: LiteralString
-punctuation: LiteralString
-printable: LiteralString
-whitespace: LiteralString
+whitespace: Final = " \t\n\r\v\f"
+ascii_lowercase: Final = "abcdefghijklmnopqrstuvwxyz"
+ascii_uppercase: Final = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ascii_letters: Final[LiteralString]  # string too long
+digits: Final = "0123456789"
+hexdigits: Final = "0123456789abcdefABCDEF"
+octdigits: Final = "01234567"
+punctuation: Final = r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
+printable: Final[LiteralString]  # string too long
 
 def capwords(s: StrOrLiteralStr, sep: StrOrLiteralStr | None = None) -> StrOrLiteralStr: ...
 
diff --git a/mypy/typeshed/stdlib/stringprep.pyi b/mypy/typeshed/stdlib/stringprep.pyi
index fc28c027ca9b..d67955e499c8 100644
--- a/mypy/typeshed/stdlib/stringprep.pyi
+++ b/mypy/typeshed/stdlib/stringprep.pyi
@@ -1,10 +1,12 @@
-b1_set: set[int]
-b3_exceptions: dict[int, str]
-c22_specials: set[int]
-c6_set: set[int]
-c7_set: set[int]
-c8_set: set[int]
-c9_set: set[int]
+from typing import Final
+
+b1_set: Final[set[int]]
+b3_exceptions: Final[dict[int, str]]
+c22_specials: Final[set[int]]
+c6_set: Final[set[int]]
+c7_set: Final[set[int]]
+c8_set: Final[set[int]]
+c9_set: Final[set[int]]
 
 def in_table_a1(code: str) -> bool: ...
 def in_table_b1(code: str) -> bool: ...
diff --git a/mypy/typeshed/stdlib/subprocess.pyi b/mypy/typeshed/stdlib/subprocess.pyi
index 8b72e2ec7ae2..e1e25bcb50cb 100644
--- a/mypy/typeshed/stdlib/subprocess.pyi
+++ b/mypy/typeshed/stdlib/subprocess.pyi
@@ -106,7 +106,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -140,7 +140,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -174,7 +174,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -209,7 +209,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the *real* keyword only args start
         capture_output: bool = False,
         check: bool = False,
@@ -243,7 +243,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -277,7 +277,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -314,7 +314,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -347,7 +347,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -380,7 +380,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -414,7 +414,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the *real* keyword only args start
         capture_output: bool = False,
         check: bool = False,
@@ -447,7 +447,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -480,7 +480,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -516,7 +516,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -548,7 +548,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -580,7 +580,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -613,7 +613,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the *real* keyword only args start
         capture_output: bool = False,
         check: bool = False,
@@ -645,7 +645,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -677,7 +677,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         capture_output: bool = False,
         check: bool = False,
@@ -712,7 +712,7 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         encoding: str | None = None,
         timeout: float | None = None,
@@ -744,7 +744,7 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         encoding: str | None = None,
         timeout: float | None = None,
@@ -774,7 +774,7 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         encoding: str | None = None,
         timeout: float | None = None,
@@ -805,8 +805,8 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
-        timeout: float | None = ...,
+        pass_fds: Collection[int] = (),
+        timeout: float | None = None,
         *,
         encoding: str | None = None,
         text: bool | None = None,
@@ -837,8 +837,8 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
-        timeout: float | None = ...,
+        pass_fds: Collection[int] = (),
+        timeout: float | None = None,
         *,
         encoding: str | None = None,
         text: bool | None = None,
@@ -867,8 +867,8 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
-        timeout: float | None = ...,
+        pass_fds: Collection[int] = (),
+        timeout: float | None = None,
         *,
         encoding: str | None = None,
         text: bool | None = None,
@@ -897,10 +897,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: Literal[True],
@@ -928,10 +928,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str,
         errors: str | None = None,
         text: bool | None = None,
@@ -959,10 +959,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str,
         text: bool | None = None,
@@ -991,10 +991,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the real keyword only ones start
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
@@ -1022,10 +1022,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: None = None,
         errors: None = None,
         text: Literal[False] | None = None,
@@ -1053,10 +1053,10 @@ if sys.version_info >= (3, 11):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
@@ -1087,10 +1087,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: Literal[True],
@@ -1117,10 +1117,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str,
         errors: str | None = None,
         text: bool | None = None,
@@ -1147,10 +1147,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str,
         text: bool | None = None,
@@ -1178,10 +1178,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the real keyword only ones start
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
@@ -1208,10 +1208,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: None = None,
         errors: None = None,
         text: Literal[False] | None = None,
@@ -1238,10 +1238,10 @@ elif sys.version_info >= (3, 10):
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
@@ -1270,10 +1270,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: Literal[True],
@@ -1299,10 +1299,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str,
         errors: str | None = None,
         text: bool | None = None,
@@ -1328,10 +1328,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str,
         text: bool | None = None,
@@ -1358,10 +1358,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         # where the real keyword only ones start
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
@@ -1387,10 +1387,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: None = None,
         errors: None = None,
         text: Literal[False] | None = None,
@@ -1416,10 +1416,10 @@ else:
         creationflags: int = 0,
         restore_signals: bool = True,
         start_new_session: bool = False,
-        pass_fds: Collection[int] = ...,
+        pass_fds: Collection[int] = (),
         *,
         timeout: float | None = None,
-        input: _InputString | None = ...,
+        input: _InputString | None = None,
         encoding: str | None = None,
         errors: str | None = None,
         text: bool | None = None,
diff --git a/mypy/typeshed/stdlib/sunau.pyi b/mypy/typeshed/stdlib/sunau.pyi
index d81645cb5687..f83a0a4c520e 100644
--- a/mypy/typeshed/stdlib/sunau.pyi
+++ b/mypy/typeshed/stdlib/sunau.pyi
@@ -1,25 +1,25 @@
 from _typeshed import Unused
-from typing import IO, Any, Literal, NamedTuple, NoReturn, overload
+from typing import IO, Any, Final, Literal, NamedTuple, NoReturn, overload
 from typing_extensions import Self, TypeAlias
 
 _File: TypeAlias = str | IO[bytes]
 
 class Error(Exception): ...
 
-AUDIO_FILE_MAGIC: int
-AUDIO_FILE_ENCODING_MULAW_8: int
-AUDIO_FILE_ENCODING_LINEAR_8: int
-AUDIO_FILE_ENCODING_LINEAR_16: int
-AUDIO_FILE_ENCODING_LINEAR_24: int
-AUDIO_FILE_ENCODING_LINEAR_32: int
-AUDIO_FILE_ENCODING_FLOAT: int
-AUDIO_FILE_ENCODING_DOUBLE: int
-AUDIO_FILE_ENCODING_ADPCM_G721: int
-AUDIO_FILE_ENCODING_ADPCM_G722: int
-AUDIO_FILE_ENCODING_ADPCM_G723_3: int
-AUDIO_FILE_ENCODING_ADPCM_G723_5: int
-AUDIO_FILE_ENCODING_ALAW_8: int
-AUDIO_UNKNOWN_SIZE: int
+AUDIO_FILE_MAGIC: Final = 0x2E736E64
+AUDIO_FILE_ENCODING_MULAW_8: Final = 1
+AUDIO_FILE_ENCODING_LINEAR_8: Final = 2
+AUDIO_FILE_ENCODING_LINEAR_16: Final = 3
+AUDIO_FILE_ENCODING_LINEAR_24: Final = 4
+AUDIO_FILE_ENCODING_LINEAR_32: Final = 5
+AUDIO_FILE_ENCODING_FLOAT: Final = 6
+AUDIO_FILE_ENCODING_DOUBLE: Final = 7
+AUDIO_FILE_ENCODING_ADPCM_G721: Final = 23
+AUDIO_FILE_ENCODING_ADPCM_G722: Final = 24
+AUDIO_FILE_ENCODING_ADPCM_G723_3: Final = 25
+AUDIO_FILE_ENCODING_ADPCM_G723_5: Final = 26
+AUDIO_FILE_ENCODING_ALAW_8: Final = 27
+AUDIO_UNKNOWN_SIZE: Final = 0xFFFFFFFF
 
 class _sunau_params(NamedTuple):
     nchannels: int
diff --git a/mypy/typeshed/stdlib/symbol.pyi b/mypy/typeshed/stdlib/symbol.pyi
index 48ae3567a1a5..5344ce504c6c 100644
--- a/mypy/typeshed/stdlib/symbol.pyi
+++ b/mypy/typeshed/stdlib/symbol.pyi
@@ -1,93 +1,95 @@
-single_input: int
-file_input: int
-eval_input: int
-decorator: int
-decorators: int
-decorated: int
-async_funcdef: int
-funcdef: int
-parameters: int
-typedargslist: int
-tfpdef: int
-varargslist: int
-vfpdef: int
-stmt: int
-simple_stmt: int
-small_stmt: int
-expr_stmt: int
-annassign: int
-testlist_star_expr: int
-augassign: int
-del_stmt: int
-pass_stmt: int
-flow_stmt: int
-break_stmt: int
-continue_stmt: int
-return_stmt: int
-yield_stmt: int
-raise_stmt: int
-import_stmt: int
-import_name: int
-import_from: int
-import_as_name: int
-dotted_as_name: int
-import_as_names: int
-dotted_as_names: int
-dotted_name: int
-global_stmt: int
-nonlocal_stmt: int
-assert_stmt: int
-compound_stmt: int
-async_stmt: int
-if_stmt: int
-while_stmt: int
-for_stmt: int
-try_stmt: int
-with_stmt: int
-with_item: int
-except_clause: int
-suite: int
-test: int
-test_nocond: int
-lambdef: int
-lambdef_nocond: int
-or_test: int
-and_test: int
-not_test: int
-comparison: int
-comp_op: int
-star_expr: int
-expr: int
-xor_expr: int
-and_expr: int
-shift_expr: int
-arith_expr: int
-term: int
-factor: int
-power: int
-atom_expr: int
-atom: int
-testlist_comp: int
-trailer: int
-subscriptlist: int
-subscript: int
-sliceop: int
-exprlist: int
-testlist: int
-dictorsetmaker: int
-classdef: int
-arglist: int
-argument: int
-comp_iter: int
-comp_for: int
-comp_if: int
-encoding_decl: int
-yield_expr: int
-yield_arg: int
-sync_comp_for: int
-func_body_suite: int
-func_type: int
-func_type_input: int
-namedexpr_test: int
-typelist: int
-sym_name: dict[int, str]
+from typing import Final
+
+single_input: Final[int]
+file_input: Final[int]
+eval_input: Final[int]
+decorator: Final[int]
+decorators: Final[int]
+decorated: Final[int]
+async_funcdef: Final[int]
+funcdef: Final[int]
+parameters: Final[int]
+typedargslist: Final[int]
+tfpdef: Final[int]
+varargslist: Final[int]
+vfpdef: Final[int]
+stmt: Final[int]
+simple_stmt: Final[int]
+small_stmt: Final[int]
+expr_stmt: Final[int]
+annassign: Final[int]
+testlist_star_expr: Final[int]
+augassign: Final[int]
+del_stmt: Final[int]
+pass_stmt: Final[int]
+flow_stmt: Final[int]
+break_stmt: Final[int]
+continue_stmt: Final[int]
+return_stmt: Final[int]
+yield_stmt: Final[int]
+raise_stmt: Final[int]
+import_stmt: Final[int]
+import_name: Final[int]
+import_from: Final[int]
+import_as_name: Final[int]
+dotted_as_name: Final[int]
+import_as_names: Final[int]
+dotted_as_names: Final[int]
+dotted_name: Final[int]
+global_stmt: Final[int]
+nonlocal_stmt: Final[int]
+assert_stmt: Final[int]
+compound_stmt: Final[int]
+async_stmt: Final[int]
+if_stmt: Final[int]
+while_stmt: Final[int]
+for_stmt: Final[int]
+try_stmt: Final[int]
+with_stmt: Final[int]
+with_item: Final[int]
+except_clause: Final[int]
+suite: Final[int]
+test: Final[int]
+test_nocond: Final[int]
+lambdef: Final[int]
+lambdef_nocond: Final[int]
+or_test: Final[int]
+and_test: Final[int]
+not_test: Final[int]
+comparison: Final[int]
+comp_op: Final[int]
+star_expr: Final[int]
+expr: Final[int]
+xor_expr: Final[int]
+and_expr: Final[int]
+shift_expr: Final[int]
+arith_expr: Final[int]
+term: Final[int]
+factor: Final[int]
+power: Final[int]
+atom_expr: Final[int]
+atom: Final[int]
+testlist_comp: Final[int]
+trailer: Final[int]
+subscriptlist: Final[int]
+subscript: Final[int]
+sliceop: Final[int]
+exprlist: Final[int]
+testlist: Final[int]
+dictorsetmaker: Final[int]
+classdef: Final[int]
+arglist: Final[int]
+argument: Final[int]
+comp_iter: Final[int]
+comp_for: Final[int]
+comp_if: Final[int]
+encoding_decl: Final[int]
+yield_expr: Final[int]
+yield_arg: Final[int]
+sync_comp_for: Final[int]
+func_body_suite: Final[int]
+func_type: Final[int]
+func_type_input: Final[int]
+namedexpr_test: Final[int]
+typelist: Final[int]
+sym_name: Final[dict[int, str]]
diff --git a/mypy/typeshed/stdlib/symtable.pyi b/mypy/typeshed/stdlib/symtable.pyi
index d5f2be04b600..a727b878688e 100644
--- a/mypy/typeshed/stdlib/symtable.pyi
+++ b/mypy/typeshed/stdlib/symtable.pyi
@@ -49,8 +49,11 @@ class Function(SymbolTable):
     def get_nonlocals(self) -> tuple[str, ...]: ...
 
 class Class(SymbolTable):
-    @deprecated("deprecated in Python 3.14, will be removed in Python 3.16")
-    def get_methods(self) -> tuple[str, ...]: ...
+    if sys.version_info >= (3, 14):
+        @deprecated("Deprecated since Python 3.14; will be removed in Python 3.16.")
+        def get_methods(self) -> tuple[str, ...]: ...
+    else:
+        def get_methods(self) -> tuple[str, ...]: ...
 
 class Symbol:
     def __init__(
diff --git a/mypy/typeshed/stdlib/sys/__init__.pyi b/mypy/typeshed/stdlib/sys/__init__.pyi
index b16e7c0abd05..7807b0eab01f 100644
--- a/mypy/typeshed/stdlib/sys/__init__.pyi
+++ b/mypy/typeshed/stdlib/sys/__init__.pyi
@@ -345,7 +345,7 @@ version_info: _version_info
 def call_tracing(func: Callable[..., _T], args: Any, /) -> _T: ...
 
 if sys.version_info >= (3, 13):
-    @deprecated("Deprecated in Python 3.13; use _clear_internal_caches() instead.")
+    @deprecated("Deprecated since Python 3.13. Use `_clear_internal_caches()` instead.")
     def _clear_type_cache() -> None: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/sys/_monitoring.pyi b/mypy/typeshed/stdlib/sys/_monitoring.pyi
index 3a8292ea0df4..5d231c7a93b3 100644
--- a/mypy/typeshed/stdlib/sys/_monitoring.pyi
+++ b/mypy/typeshed/stdlib/sys/_monitoring.pyi
@@ -11,10 +11,10 @@ from types import CodeType
 from typing import Any, Final, type_check_only
 from typing_extensions import deprecated
 
-DEBUGGER_ID: Final[int]
-COVERAGE_ID: Final[int]
-PROFILER_ID: Final[int]
-OPTIMIZER_ID: Final[int]
+DEBUGGER_ID: Final = 0
+COVERAGE_ID: Final = 1
+PROFILER_ID: Final = 2
+OPTIMIZER_ID: Final = 5
 
 def use_tool_id(tool_id: int, name: str, /) -> None: ...
 def free_tool_id(tool_id: int, /) -> None: ...
@@ -46,7 +46,7 @@ class _events:
         BRANCH_TAKEN: Final[int]
 
         @property
-        @deprecated("BRANCH is deprecated; use BRANCH_LEFT or BRANCH_TAKEN instead")
+        @deprecated("Deprecated since Python 3.14. Use `BRANCH_LEFT` or `BRANCH_TAKEN` instead.")
         def BRANCH(self) -> int: ...
 
     else:
diff --git a/mypy/typeshed/stdlib/tarfile.pyi b/mypy/typeshed/stdlib/tarfile.pyi
index 4e394409bbe0..f6623ea9929d 100644
--- a/mypy/typeshed/stdlib/tarfile.pyi
+++ b/mypy/typeshed/stdlib/tarfile.pyi
@@ -656,7 +656,7 @@ class TarFile:
         members: Iterable[TarInfo] | None = None,
         *,
         numeric_owner: bool = False,
-        filter: _TarfileFilter | None = ...,
+        filter: _TarfileFilter | None = None,
     ) -> None: ...
     # Same situation as for `extractall`.
     def extract(
@@ -666,7 +666,7 @@ class TarFile:
         set_attrs: bool = True,
         *,
         numeric_owner: bool = False,
-        filter: _TarfileFilter | None = ...,
+        filter: _TarfileFilter | None = None,
     ) -> None: ...
     def _extract_member(
         self,
@@ -744,6 +744,28 @@ def tar_filter(member: TarInfo, dest_path: str) -> TarInfo: ...
 def data_filter(member: TarInfo, dest_path: str) -> TarInfo: ...
 
 class TarInfo:
+    __slots__ = (
+        "name",
+        "mode",
+        "uid",
+        "gid",
+        "size",
+        "mtime",
+        "chksum",
+        "type",
+        "linkname",
+        "uname",
+        "gname",
+        "devmajor",
+        "devminor",
+        "offset",
+        "offset_data",
+        "pax_headers",
+        "sparse",
+        "_tarfile",
+        "_sparse_structs",
+        "_link_target",
+    )
     name: str
     path: str
     size: int
@@ -765,10 +787,10 @@ class TarInfo:
     def __init__(self, name: str = "") -> None: ...
     if sys.version_info >= (3, 13):
         @property
-        @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.16")
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.16.")
         def tarfile(self) -> TarFile | None: ...
         @tarfile.setter
-        @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.16")
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.16.")
         def tarfile(self, tarfile: TarFile | None) -> None: ...
     else:
         tarfile: TarFile | None
diff --git a/mypy/typeshed/stdlib/telnetlib.pyi b/mypy/typeshed/stdlib/telnetlib.pyi
index 6b599256d17b..88aa43d24899 100644
--- a/mypy/typeshed/stdlib/telnetlib.pyi
+++ b/mypy/typeshed/stdlib/telnetlib.pyi
@@ -2,89 +2,89 @@ import socket
 from collections.abc import Callable, MutableSequence, Sequence
 from re import Match, Pattern
 from types import TracebackType
-from typing import Any
+from typing import Any, Final
 from typing_extensions import Self
 
 __all__ = ["Telnet"]
 
-DEBUGLEVEL: int
-TELNET_PORT: int
+DEBUGLEVEL: Final = 0
+TELNET_PORT: Final = 23
 
-IAC: bytes
-DONT: bytes
-DO: bytes
-WONT: bytes
-WILL: bytes
-theNULL: bytes
+IAC: Final = b"\xff"
+DONT: Final = b"\xfe"
+DO: Final = b"\xfd"
+WONT: Final = b"\xfc"
+WILL: Final = b"\xfb"
+theNULL: Final = b"\x00"
 
-SE: bytes
-NOP: bytes
-DM: bytes
-BRK: bytes
-IP: bytes
-AO: bytes
-AYT: bytes
-EC: bytes
-EL: bytes
-GA: bytes
-SB: bytes
+SE: Final = b"\xf0"
+NOP: Final = b"\xf1"
+DM: Final = b"\xf2"
+BRK: Final = b"\xf3"
+IP: Final = b"\xf4"
+AO: Final = b"\xf5"
+AYT: Final = b"\xf6"
+EC: Final = b"\xf7"
+EL: Final = b"\xf8"
+GA: Final = b"\xf9"
+SB: Final = b"\xfa"
 
-BINARY: bytes
-ECHO: bytes
-RCP: bytes
-SGA: bytes
-NAMS: bytes
-STATUS: bytes
-TM: bytes
-RCTE: bytes
-NAOL: bytes
-NAOP: bytes
-NAOCRD: bytes
-NAOHTS: bytes
-NAOHTD: bytes
-NAOFFD: bytes
-NAOVTS: bytes
-NAOVTD: bytes
-NAOLFD: bytes
-XASCII: bytes
-LOGOUT: bytes
-BM: bytes
-DET: bytes
-SUPDUP: bytes
-SUPDUPOUTPUT: bytes
-SNDLOC: bytes
-TTYPE: bytes
-EOR: bytes
-TUID: bytes
-OUTMRK: bytes
-TTYLOC: bytes
-VT3270REGIME: bytes
-X3PAD: bytes
-NAWS: bytes
-TSPEED: bytes
-LFLOW: bytes
-LINEMODE: bytes
-XDISPLOC: bytes
-OLD_ENVIRON: bytes
-AUTHENTICATION: bytes
-ENCRYPT: bytes
-NEW_ENVIRON: bytes
+BINARY: Final = b"\x00"
+ECHO: Final = b"\x01"
+RCP: Final = b"\x02"
+SGA: Final = b"\x03"
+NAMS: Final = b"\x04"
+STATUS: Final = b"\x05"
+TM: Final = b"\x06"
+RCTE: Final = b"\x07"
+NAOL: Final = b"\x08"
+NAOP: Final = b"\t"
+NAOCRD: Final = b"\n"
+NAOHTS: Final = b"\x0b"
+NAOHTD: Final = b"\x0c"
+NAOFFD: Final = b"\r"
+NAOVTS: Final = b"\x0e"
+NAOVTD: Final = b"\x0f"
+NAOLFD: Final = b"\x10"
+XASCII: Final = b"\x11"
+LOGOUT: Final = b"\x12"
+BM: Final = b"\x13"
+DET: Final = b"\x14"
+SUPDUP: Final = b"\x15"
+SUPDUPOUTPUT: Final = b"\x16"
+SNDLOC: Final = b"\x17"
+TTYPE: Final = b"\x18"
+EOR: Final = b"\x19"
+TUID: Final = b"\x1a"
+OUTMRK: Final = b"\x1b"
+TTYLOC: Final = b"\x1c"
+VT3270REGIME: Final = b"\x1d"
+X3PAD: Final = b"\x1e"
+NAWS: Final = b"\x1f"
+TSPEED: Final = b" "
+LFLOW: Final = b"!"
+LINEMODE: Final = b'"'
+XDISPLOC: Final = b"#"
+OLD_ENVIRON: Final = b"$"
+AUTHENTICATION: Final = b"%"
+ENCRYPT: Final = b"&"
+NEW_ENVIRON: Final = b"'"
 
-TN3270E: bytes
-XAUTH: bytes
-CHARSET: bytes
-RSP: bytes
-COM_PORT_OPTION: bytes
-SUPPRESS_LOCAL_ECHO: bytes
-TLS: bytes
-KERMIT: bytes
-SEND_URL: bytes
-FORWARD_X: bytes
-PRAGMA_LOGON: bytes
-SSPI_LOGON: bytes
-PRAGMA_HEARTBEAT: bytes
-EXOPL: bytes
-NOOPT: bytes
+TN3270E: Final = b"("
+XAUTH: Final = b")"
+CHARSET: Final = b"*"
+RSP: Final = b"+"
+COM_PORT_OPTION: Final = b","
+SUPPRESS_LOCAL_ECHO: Final = b"-"
+TLS: Final = b"."
+KERMIT: Final = b"/"
+SEND_URL: Final = b"0"
+FORWARD_X: Final = b"1"
+PRAGMA_LOGON: Final = b"\x8a"
+SSPI_LOGON: Final = b"\x8b"
+PRAGMA_HEARTBEAT: Final = b"\x8c"
+EXOPL: Final = b"\xff"
+NOOPT: Final = b"\x00"
 
 class Telnet:
     host: str | None  # undocumented
diff --git a/mypy/typeshed/stdlib/tempfile.pyi b/mypy/typeshed/stdlib/tempfile.pyi
index 6b2abe4398d2..26491074ff71 100644
--- a/mypy/typeshed/stdlib/tempfile.pyi
+++ b/mypy/typeshed/stdlib/tempfile.pyi
@@ -14,7 +14,7 @@ from _typeshed import (
 )
 from collections.abc import Iterable, Iterator
 from types import GenericAlias, TracebackType
-from typing import IO, Any, AnyStr, Generic, Literal, overload
+from typing import IO, Any, AnyStr, Final, Generic, Literal, overload
 from typing_extensions import Self, deprecated
 
 __all__ = [
@@ -34,7 +34,7 @@ __all__ = [
 ]
 
 # global variables
-TMP_MAX: int
+TMP_MAX: Final[int]
 tempdir: str | None
 template: str
 
diff --git a/mypy/typeshed/stdlib/threading.pyi b/mypy/typeshed/stdlib/threading.pyi
index 033cad3931f5..28fa5267a997 100644
--- a/mypy/typeshed/stdlib/threading.pyi
+++ b/mypy/typeshed/stdlib/threading.pyi
@@ -5,7 +5,7 @@ from _typeshed import ProfileFunction, TraceFunction
 from collections.abc import Callable, Iterable, Mapping
 from contextvars import ContextVar
 from types import TracebackType
-from typing import Any, TypeVar, final
+from typing import Any, Final, TypeVar, final
 from typing_extensions import deprecated
 
 _T = TypeVar("_T")
@@ -46,10 +46,10 @@ if sys.version_info >= (3, 12):
 _profile_hook: ProfileFunction | None
 
 def active_count() -> int: ...
-@deprecated("Use active_count() instead")
+@deprecated("Deprecated since Python 3.10. Use `active_count()` instead.")
 def activeCount() -> int: ...
 def current_thread() -> Thread: ...
-@deprecated("Use current_thread() instead")
+@deprecated("Deprecated since Python 3.10. Use `current_thread()` instead.")
 def currentThread() -> Thread: ...
 def get_ident() -> int: ...
 def enumerate() -> list[Thread]: ...
@@ -67,7 +67,7 @@ if sys.version_info >= (3, 10):
 
 def stack_size(size: int = 0, /) -> int: ...
 
-TIMEOUT_MAX: float
+TIMEOUT_MAX: Final[float]
 
 ThreadError = _thread.error
 local = _thread._local
@@ -107,13 +107,13 @@ class Thread:
     @property
     def native_id(self) -> int | None: ...  # only available on some platforms
     def is_alive(self) -> bool: ...
-    @deprecated("Get the daemon attribute instead")
+    @deprecated("Deprecated since Python 3.10. Read the `daemon` attribute instead.")
     def isDaemon(self) -> bool: ...
-    @deprecated("Set the daemon attribute instead")
+    @deprecated("Deprecated since Python 3.10. Set the `daemon` attribute instead.")
     def setDaemon(self, daemonic: bool) -> None: ...
-    @deprecated("Use the name attribute instead")
+    @deprecated("Deprecated since Python 3.10. Read the `name` attribute instead.")
     def getName(self) -> str: ...
-    @deprecated("Use the name attribute instead")
+    @deprecated("Deprecated since Python 3.10. Set the `name` attribute instead.")
     def setName(self, name: str) -> None: ...
 
 class _DummyThread(Thread):
@@ -148,7 +148,7 @@ class Condition:
     def wait_for(self, predicate: Callable[[], _T], timeout: float | None = None) -> _T: ...
     def notify(self, n: int = 1) -> None: ...
     def notify_all(self) -> None: ...
-    @deprecated("Use notify_all() instead")
+    @deprecated("Deprecated since Python 3.10. Use `notify_all()` instead.")
     def notifyAll(self) -> None: ...
 
 class Semaphore:
@@ -163,7 +163,7 @@ class BoundedSemaphore(Semaphore): ...
 
 class Event:
     def is_set(self) -> bool: ...
-    @deprecated("Use is_set() instead")
+    @deprecated("Deprecated since Python 3.10. Use `is_set()` instead.")
     def isSet(self) -> bool: ...
     def set(self) -> None: ...
     def clear(self) -> None: ...
diff --git a/mypy/typeshed/stdlib/time.pyi b/mypy/typeshed/stdlib/time.pyi
index a921722b62c5..5665efbba69d 100644
--- a/mypy/typeshed/stdlib/time.pyi
+++ b/mypy/typeshed/stdlib/time.pyi
@@ -11,28 +11,28 @@ timezone: int
 tzname: tuple[str, str]
 
 if sys.platform == "linux":
-    CLOCK_BOOTTIME: int
+    CLOCK_BOOTTIME: Final[int]
 if sys.platform != "linux" and sys.platform != "win32" and sys.platform != "darwin":
-    CLOCK_PROF: int  # FreeBSD, NetBSD, OpenBSD
-    CLOCK_UPTIME: int  # FreeBSD, OpenBSD
+    CLOCK_PROF: Final[int]  # FreeBSD, NetBSD, OpenBSD
+    CLOCK_UPTIME: Final[int]  # FreeBSD, OpenBSD
 
 if sys.platform != "win32":
-    CLOCK_MONOTONIC: int
-    CLOCK_MONOTONIC_RAW: int
-    CLOCK_PROCESS_CPUTIME_ID: int
-    CLOCK_REALTIME: int
-    CLOCK_THREAD_CPUTIME_ID: int
+    CLOCK_MONOTONIC: Final[int]
+    CLOCK_MONOTONIC_RAW: Final[int]
+    CLOCK_PROCESS_CPUTIME_ID: Final[int]
+    CLOCK_REALTIME: Final[int]
+    CLOCK_THREAD_CPUTIME_ID: Final[int]
     if sys.platform != "linux" and sys.platform != "darwin":
-        CLOCK_HIGHRES: int  # Solaris only
+        CLOCK_HIGHRES: Final[int]  # Solaris only
 
 if sys.platform == "darwin":
-    CLOCK_UPTIME_RAW: int
+    CLOCK_UPTIME_RAW: Final[int]
     if sys.version_info >= (3, 13):
-        CLOCK_UPTIME_RAW_APPROX: int
-        CLOCK_MONOTONIC_RAW_APPROX: int
+        CLOCK_UPTIME_RAW_APPROX: Final[int]
+        CLOCK_MONOTONIC_RAW_APPROX: Final[int]
 
 if sys.platform == "linux":
-    CLOCK_TAI: int
+    CLOCK_TAI: Final[int]
 
 # Constructor takes an iterable of any type, of length between 9 and 11 elements.
 # However, it always *behaves* like a tuple of 9 elements,
diff --git a/mypy/typeshed/stdlib/tkinter/__init__.pyi b/mypy/typeshed/stdlib/tkinter/__init__.pyi
index 76b2ddcf17df..54dd70baf199 100644
--- a/mypy/typeshed/stdlib/tkinter/__init__.pyi
+++ b/mypy/typeshed/stdlib/tkinter/__init__.pyi
@@ -5,8 +5,8 @@ from collections.abc import Callable, Iterable, Mapping, Sequence
 from tkinter.constants import *
 from tkinter.font import _FontDescription
 from types import GenericAlias, TracebackType
-from typing import Any, ClassVar, Generic, Literal, NamedTuple, Protocol, TypedDict, TypeVar, overload, type_check_only
-from typing_extensions import TypeAlias, TypeVarTuple, Unpack, deprecated
+from typing import Any, ClassVar, Final, Generic, Literal, NamedTuple, Protocol, TypedDict, TypeVar, overload, type_check_only
+from typing_extensions import TypeAlias, TypeVarTuple, Unpack, deprecated, disjoint_base
 
 if sys.version_info >= (3, 11):
     from enum import StrEnum
@@ -153,11 +153,11 @@ __all__ = [
 
 TclError = _tkinter.TclError
 wantobjects: int
-TkVersion: float
-TclVersion: float
-READABLE = _tkinter.READABLE
-WRITABLE = _tkinter.WRITABLE
-EXCEPTION = _tkinter.EXCEPTION
+TkVersion: Final[float]
+TclVersion: Final[float]
+READABLE: Final = _tkinter.READABLE
+WRITABLE: Final = _tkinter.WRITABLE
+EXCEPTION: Final = _tkinter.EXCEPTION
 
 # Quick guide for figuring out which widget class to choose:
 #   - Misc: any widget (don't use BaseWidget because Tk doesn't inherit from BaseWidget)
@@ -198,7 +198,11 @@ if sys.version_info >= (3, 11):
         releaselevel: str
         serial: int
 
-    class _VersionInfoType(_VersionInfoTypeBase): ...
+    if sys.version_info >= (3, 12):
+        class _VersionInfoType(_VersionInfoTypeBase): ...
+    else:
+        @disjoint_base
+        class _VersionInfoType(_VersionInfoTypeBase): ...
 
 if sys.version_info >= (3, 11):
     class EventType(StrEnum):
@@ -321,14 +325,21 @@ class Variable:
     def trace_add(self, mode: Literal["array", "read", "write", "unset"], callback: Callable[[str, str, str], object]) -> str: ...
     def trace_remove(self, mode: Literal["array", "read", "write", "unset"], cbname: str) -> None: ...
     def trace_info(self) -> list[tuple[tuple[Literal["array", "read", "write", "unset"], ...], str]]: ...
-    @deprecated("use trace_add() instead of trace()")
-    def trace(self, mode, callback): ...
-    @deprecated("use trace_add() instead of trace_variable()")
-    def trace_variable(self, mode, callback): ...
-    @deprecated("use trace_remove() instead of trace_vdelete()")
-    def trace_vdelete(self, mode, cbname) -> None: ...
-    @deprecated("use trace_info() instead of trace_vinfo()")
-    def trace_vinfo(self): ...
+    if sys.version_info >= (3, 14):
+        @deprecated("Deprecated since Python 3.14. Use `trace_add()` instead.")
+        def trace(self, mode, callback) -> str: ...
+        @deprecated("Deprecated since Python 3.14. Use `trace_add()` instead.")
+        def trace_variable(self, mode, callback) -> str: ...
+        @deprecated("Deprecated since Python 3.14. Use `trace_remove()` instead.")
+        def trace_vdelete(self, mode, cbname) -> None: ...
+        @deprecated("Deprecated since Python 3.14. Use `trace_info()` instead.")
+        def trace_vinfo(self): ...
+    else:
+        def trace(self, mode, callback) -> str: ...
+        def trace_variable(self, mode, callback) -> str: ...
+        def trace_vdelete(self, mode, cbname) -> None: ...
+        def trace_vinfo(self): ...
+
     def __eq__(self, other: object) -> bool: ...
     def __del__(self) -> None: ...
     __hash__: ClassVar[None]  # type: ignore[assignment]
@@ -359,8 +370,8 @@ class BooleanVar(Variable):
 
 def mainloop(n: int = 0) -> None: ...
 
-getint: Incomplete
-getdouble: Incomplete
+getint = int
+getdouble = float
 
 def getboolean(s): ...
 
@@ -3468,7 +3479,7 @@ class Text(Widget, XView, YView):
     def image_configure(
         self,
         index: _TextIndex,
-        cnf: dict[str, Any] | None = {},
+        cnf: dict[str, Any] | None = None,
         *,
         align: Literal["baseline", "bottom", "center", "top"] = ...,
         image: _ImageSpec = ...,
diff --git a/mypy/typeshed/stdlib/tkinter/messagebox.pyi b/mypy/typeshed/stdlib/tkinter/messagebox.pyi
index 8e5a88f92ea1..cd95f0de5f80 100644
--- a/mypy/typeshed/stdlib/tkinter/messagebox.pyi
+++ b/mypy/typeshed/stdlib/tkinter/messagebox.pyi
@@ -30,7 +30,7 @@ def showinfo(
     *,
     detail: str = ...,
     icon: Literal["error", "info", "question", "warning"] = ...,
-    default: Literal["ok"] = ...,
+    default: Literal["ok"] = "ok",
     parent: Misc = ...,
 ) -> str: ...
 def showwarning(
@@ -39,7 +39,7 @@ def showwarning(
     *,
     detail: str = ...,
     icon: Literal["error", "info", "question", "warning"] = ...,
-    default: Literal["ok"] = ...,
+    default: Literal["ok"] = "ok",
     parent: Misc = ...,
 ) -> str: ...
 def showerror(
@@ -48,7 +48,7 @@ def showerror(
     *,
     detail: str = ...,
     icon: Literal["error", "info", "question", "warning"] = ...,
-    default: Literal["ok"] = ...,
+    default: Literal["ok"] = "ok",
     parent: Misc = ...,
 ) -> str: ...
 def askquestion(
diff --git a/mypy/typeshed/stdlib/tkinter/ttk.pyi b/mypy/typeshed/stdlib/tkinter/ttk.pyi
index c46239df81eb..86c55eba7006 100644
--- a/mypy/typeshed/stdlib/tkinter/ttk.pyi
+++ b/mypy/typeshed/stdlib/tkinter/ttk.pyi
@@ -1,10 +1,11 @@
 import _tkinter
+import sys
 import tkinter
-from _typeshed import Incomplete, MaybeNone
-from collections.abc import Callable
+from _typeshed import MaybeNone
+from collections.abc import Callable, Iterable
 from tkinter.font import _FontDescription
 from typing import Any, Literal, TypedDict, overload, type_check_only
-from typing_extensions import TypeAlias
+from typing_extensions import Never, TypeAlias, Unpack
 
 __all__ = [
     "Button",
@@ -35,7 +36,7 @@ __all__ = [
 ]
 
 def tclobjs_to_py(adict: dict[Any, Any]) -> dict[Any, Any]: ...
-def setup_master(master=None): ...
+def setup_master(master: tkinter.Misc | None = None): ...
 
 _Padding: TypeAlias = (
     tkinter._ScreenUnits
@@ -48,19 +49,153 @@ _Padding: TypeAlias = (
 # from ttk_widget (aka ttk::widget) manual page, differs from tkinter._Compound
 _TtkCompound: TypeAlias = Literal["", "text", "image", tkinter._Compound]
 
+# Last item (option value to apply) varies between different options so use Any.
+# It could also be any iterable with items matching the tuple, but that case
+# hasn't been added here for consistency with _Padding above.
+_Statespec: TypeAlias = tuple[Unpack[tuple[str, ...]], Any]
+_ImageStatespec: TypeAlias = tuple[Unpack[tuple[str, ...]], tkinter._ImageSpec]
+_VsapiStatespec: TypeAlias = tuple[Unpack[tuple[str, ...]], int]
+
+class _Layout(TypedDict, total=False):
+    side: Literal["left", "right", "top", "bottom"]
+    sticky: str  # consists of letters 'n', 's', 'w', 'e', may contain repeats, may be empty
+    unit: Literal[0, 1] | bool
+    children: _LayoutSpec
+    # Note: there seem to be some other undocumented keys sometimes
+
+# This could be any sequence when passed as a parameter but will always be a list when returned.
+_LayoutSpec: TypeAlias = list[tuple[str, _Layout | None]]
+
+# Keep these in sync with the appropriate methods in Style
+class _ElementCreateImageKwargs(TypedDict, total=False):
+    border: _Padding
+    height: tkinter._ScreenUnits
+    padding: _Padding
+    sticky: str
+    width: tkinter._ScreenUnits
+
+_ElementCreateArgsCrossPlatform: TypeAlias = (
+    # Could be any sequence here but types are not homogenous so just type it as tuple
+    tuple[Literal["image"], tkinter._ImageSpec, Unpack[tuple[_ImageStatespec, ...]], _ElementCreateImageKwargs]
+    | tuple[Literal["from"], str, str]
+    | tuple[Literal["from"], str]  # (fromelement is optional)
+)
+if sys.platform == "win32" and sys.version_info >= (3, 13):
+    class _ElementCreateVsapiKwargsPadding(TypedDict, total=False):
+        padding: _Padding
+
+    class _ElementCreateVsapiKwargsMargin(TypedDict, total=False):
+        padding: _Padding
+
+    class _ElementCreateVsapiKwargsSize(TypedDict):
+        width: tkinter._ScreenUnits
+        height: tkinter._ScreenUnits
+
+    _ElementCreateVsapiKwargsDict: TypeAlias = (
+        _ElementCreateVsapiKwargsPadding | _ElementCreateVsapiKwargsMargin | _ElementCreateVsapiKwargsSize
+    )
+    _ElementCreateArgs: TypeAlias = (  # noqa: Y047  # It doesn't recognise the usage below for whatever reason
+        _ElementCreateArgsCrossPlatform
+        | tuple[Literal["vsapi"], str, int, _ElementCreateVsapiKwargsDict]
+        | tuple[Literal["vsapi"], str, int, _VsapiStatespec, _ElementCreateVsapiKwargsDict]
+    )
+else:
+    _ElementCreateArgs: TypeAlias = _ElementCreateArgsCrossPlatform
+_ThemeSettingsValue = TypedDict(
+    "_ThemeSettingsValue",
+    {
+        "configure": dict[str, Any],
+        "map": dict[str, Iterable[_Statespec]],
+        "layout": _LayoutSpec,
+        "element create": _ElementCreateArgs,
+    },
+    total=False,
+)
+_ThemeSettings: TypeAlias = dict[str, _ThemeSettingsValue]
+
 class Style:
-    master: Incomplete
+    master: tkinter.Misc
     tk: _tkinter.TkappType
     def __init__(self, master: tkinter.Misc | None = None) -> None: ...
-    def configure(self, style, query_opt=None, **kw): ...
-    def map(self, style, query_opt=None, **kw): ...
-    def lookup(self, style, option, state=None, default=None): ...
-    def layout(self, style, layoutspec=None): ...
-    def element_create(self, elementname, etype, *args, **kw) -> None: ...
-    def element_names(self): ...
-    def element_options(self, elementname): ...
-    def theme_create(self, themename, parent=None, settings=None) -> None: ...
-    def theme_settings(self, themename, settings) -> None: ...
+    # For these methods, values given vary between options. Returned values
+    # seem to be str, but this might not always be the case.
+    @overload
+    def configure(self, style: str) -> dict[str, Any] | None: ...  # Returns None if no configuration.
+    @overload
+    def configure(self, style: str, query_opt: str, **kw: Any) -> Any: ...
+    @overload
+    def configure(self, style: str, query_opt: None = None, **kw: Any) -> None: ...
+    @overload
+    def map(self, style: str, query_opt: str) -> _Statespec: ...
+    @overload
+    def map(self, style: str, query_opt: None = None, **kw: Iterable[_Statespec]) -> dict[str, _Statespec]: ...
+    def lookup(self, style: str, option: str, state: Iterable[str] | None = None, default: Any | None = None) -> Any: ...
+    @overload
+    def layout(self, style: str, layoutspec: _LayoutSpec) -> list[Never]: ...  # Always seems to return an empty list
+    @overload
+    def layout(self, style: str, layoutspec: None = None) -> _LayoutSpec: ...
+    @overload
+    def element_create(
+        self,
+        elementname: str,
+        etype: Literal["image"],
+        default_image: tkinter._ImageSpec,
+        /,
+        *imagespec: _ImageStatespec,
+        border: _Padding = ...,
+        height: tkinter._ScreenUnits = ...,
+        padding: _Padding = ...,
+        sticky: str = ...,
+        width: tkinter._ScreenUnits = ...,
+    ) -> None: ...
+    @overload
+    def element_create(self, elementname: str, etype: Literal["from"], themename: str, fromelement: str = ..., /) -> None: ...
+    if sys.platform == "win32" and sys.version_info >= (3, 13):  # and tk version >= 8.6
+        # margin, padding, and (width + height) are mutually exclusive. width
+        # and height must either both be present or not present at all. Note:
+        # There are other undocumented options if you look at ttk's source code.
+        @overload
+        def element_create(
+            self,
+            elementname: str,
+            etype: Literal["vsapi"],
+            class_: str,
+            part: int,
+            vs_statespec: _VsapiStatespec = ...,
+            /,
+            *,
+            padding: _Padding = ...,
+        ) -> None: ...
+        @overload
+        def element_create(
+            self,
+            elementname: str,
+            etype: Literal["vsapi"],
+            class_: str,
+            part: int,
+            vs_statespec: _VsapiStatespec = ...,
+            /,
+            *,
+            margin: _Padding = ...,
+        ) -> None: ...
+        @overload
+        def element_create(
+            self,
+            elementname: str,
+            etype: Literal["vsapi"],
+            class_: str,
+            part: int,
+            vs_statespec: _VsapiStatespec = ...,
+            /,
+            *,
+            width: tkinter._ScreenUnits,
+            height: tkinter._ScreenUnits,
+        ) -> None: ...
+
+    def element_names(self) -> tuple[str, ...]: ...
+    def element_options(self, elementname: str) -> tuple[str, ...]: ...
+    def theme_create(self, themename: str, parent: str | None = None, settings: _ThemeSettings | None = None) -> None: ...
+    def theme_settings(self, themename: str, settings: _ThemeSettings) -> None: ...
     def theme_names(self) -> tuple[str, ...]: ...
     @overload
     def theme_use(self, themename: str) -> None: ...
@@ -615,7 +750,7 @@ class Panedwindow(Widget, tkinter.PanedWindow):
     ) -> dict[str, tuple[str, str, str, Any, Any]] | None: ...
     @overload
     def config(self, cnf: str) -> tuple[str, str, str, Any, Any]: ...
-    forget: Incomplete
+    forget = tkinter.PanedWindow.forget
     def insert(self, pos, child, **kw) -> None: ...
     def pane(self, pane, option=None, **kw): ...
     def sashpos(self, index, newpos=None): ...
diff --git a/mypy/typeshed/stdlib/tokenize.pyi b/mypy/typeshed/stdlib/tokenize.pyi
index 1a3a80937f22..00a24b4eea07 100644
--- a/mypy/typeshed/stdlib/tokenize.pyi
+++ b/mypy/typeshed/stdlib/tokenize.pyi
@@ -3,8 +3,8 @@ from _typeshed import FileDescriptorOrPath
 from collections.abc import Callable, Generator, Iterable, Sequence
 from re import Pattern
 from token import *
-from typing import Any, NamedTuple, TextIO, type_check_only
-from typing_extensions import TypeAlias
+from typing import Any, Final, NamedTuple, TextIO, type_check_only
+from typing_extensions import TypeAlias, disjoint_base
 
 if sys.version_info < (3, 12):
     # Avoid double assignment to Final name by imports, which pyright objects to.
@@ -101,8 +101,8 @@ if sys.version_info >= (3, 13):
 if sys.version_info >= (3, 14):
     __all__ += ["TSTRING_START", "TSTRING_MIDDLE", "TSTRING_END"]
 
-cookie_re: Pattern[str]
-blank_re: Pattern[bytes]
+cookie_re: Final[Pattern[str]]
+blank_re: Final[Pattern[bytes]]
 
 _Position: TypeAlias = tuple[int, int]
 
@@ -115,9 +115,16 @@ class _TokenInfo(NamedTuple):
     end: _Position
     line: str
 
-class TokenInfo(_TokenInfo):
-    @property
-    def exact_type(self) -> int: ...
+if sys.version_info >= (3, 12):
+    class TokenInfo(_TokenInfo):
+        @property
+        def exact_type(self) -> int: ...
+
+else:
+    @disjoint_base
+    class TokenInfo(_TokenInfo):
+        @property
+        def exact_type(self) -> int: ...
 
 # Backwards compatible tokens can be sequences of a shorter length too
 _Token: TypeAlias = TokenInfo | Sequence[int | str | _Position]
@@ -151,46 +158,46 @@ def group(*choices: str) -> str: ...  # undocumented
 def any(*choices: str) -> str: ...  # undocumented
 def maybe(*choices: str) -> str: ...  # undocumented
 
-Whitespace: str  # undocumented
-Comment: str  # undocumented
-Ignore: str  # undocumented
-Name: str  # undocumented
-
-Hexnumber: str  # undocumented
-Binnumber: str  # undocumented
-Octnumber: str  # undocumented
-Decnumber: str  # undocumented
-Intnumber: str  # undocumented
-Exponent: str  # undocumented
-Pointfloat: str  # undocumented
-Expfloat: str  # undocumented
-Floatnumber: str  # undocumented
-Imagnumber: str  # undocumented
-Number: str  # undocumented
+Whitespace: Final[str]  # undocumented
+Comment: Final[str]  # undocumented
+Ignore: Final[str]  # undocumented
+Name: Final[str]  # undocumented
+
+Hexnumber: Final[str]  # undocumented
+Binnumber: Final[str]  # undocumented
+Octnumber: Final[str]  # undocumented
+Decnumber: Final[str]  # undocumented
+Intnumber: Final[str]  # undocumented
+Exponent: Final[str]  # undocumented
+Pointfloat: Final[str]  # undocumented
+Expfloat: Final[str]  # undocumented
+Floatnumber: Final[str]  # undocumented
+Imagnumber: Final[str]  # undocumented
+Number: Final[str]  # undocumented
 
 def _all_string_prefixes() -> set[str]: ...  # undocumented
 
-StringPrefix: str  # undocumented
+StringPrefix: Final[str]  # undocumented
 
-Single: str  # undocumented
-Double: str  # undocumented
-Single3: str  # undocumented
-Double3: str  # undocumented
-Triple: str  # undocumented
-String: str  # undocumented
+Single: Final[str]  # undocumented
+Double: Final[str]  # undocumented
+Single3: Final[str]  # undocumented
+Double3: Final[str]  # undocumented
+Triple: Final[str]  # undocumented
+String: Final[str]  # undocumented
 
-Special: str  # undocumented
-Funny: str  # undocumented
+Special: Final[str]  # undocumented
+Funny: Final[str]  # undocumented
 
-PlainToken: str  # undocumented
-Token: str  # undocumented
+PlainToken: Final[str]  # undocumented
+Token: Final[str]  # undocumented
 
-ContStr: str  # undocumented
-PseudoExtras: str  # undocumented
-PseudoToken: str  # undocumented
+ContStr: Final[str]  # undocumented
+PseudoExtras: Final[str]  # undocumented
+PseudoToken: Final[str]  # undocumented
 
-endpats: dict[str, str]  # undocumented
-single_quoted: set[str]  # undocumented
-triple_quoted: set[str]  # undocumented
+endpats: Final[dict[str, str]]  # undocumented
+single_quoted: Final[set[str]]  # undocumented
+triple_quoted: Final[set[str]]  # undocumented
 
-tabsize: int  # undocumented
+tabsize: Final = 8  # undocumented
diff --git a/mypy/typeshed/stdlib/tomllib.pyi b/mypy/typeshed/stdlib/tomllib.pyi
index c160ffc38bfd..4ff4097f8313 100644
--- a/mypy/typeshed/stdlib/tomllib.pyi
+++ b/mypy/typeshed/stdlib/tomllib.pyi
@@ -16,7 +16,7 @@ if sys.version_info >= (3, 14):
         @overload
         def __init__(self, msg: str, doc: str, pos: int) -> None: ...
         @overload
-        @deprecated("Deprecated in Python 3.14; Please set 'msg', 'doc' and 'pos' arguments only.")
+        @deprecated("Deprecated since Python 3.14. Set the 'msg', 'doc' and 'pos' arguments only.")
         def __init__(self, msg: str | type = ..., doc: str | type = ..., pos: int | type = ..., *args: Any) -> None: ...
 
 else:
diff --git a/mypy/typeshed/stdlib/traceback.pyi b/mypy/typeshed/stdlib/traceback.pyi
index 4553dbd08384..d587295cd1cf 100644
--- a/mypy/typeshed/stdlib/traceback.pyi
+++ b/mypy/typeshed/stdlib/traceback.pyi
@@ -138,7 +138,7 @@ class TracebackException:
         @property
         def exc_type_str(self) -> str: ...
         @property
-        @deprecated("Deprecated in 3.13. Use exc_type_str instead.")
+        @deprecated("Deprecated since Python 3.13. Use `exc_type_str` instead.")
         def exc_type(self) -> type[BaseException] | None: ...
     else:
         exc_type: type[BaseException]
@@ -245,6 +245,23 @@ class TracebackException:
         def print(self, *, file: SupportsWrite[str] | None = None, chain: bool = True) -> None: ...
 
 class FrameSummary:
+    if sys.version_info >= (3, 13):
+        __slots__ = (
+            "filename",
+            "lineno",
+            "end_lineno",
+            "colno",
+            "end_colno",
+            "name",
+            "_lines",
+            "_lines_dedented",
+            "locals",
+            "_code",
+        )
+    elif sys.version_info >= (3, 11):
+        __slots__ = ("filename", "lineno", "end_lineno", "colno", "end_colno", "name", "_line", "locals")
+    else:
+        __slots__ = ("filename", "lineno", "name", "_line", "locals")
     if sys.version_info >= (3, 11):
         def __init__(
             self,
diff --git a/mypy/typeshed/stdlib/tracemalloc.pyi b/mypy/typeshed/stdlib/tracemalloc.pyi
index 05d98ae127d8..31d8f7445639 100644
--- a/mypy/typeshed/stdlib/tracemalloc.pyi
+++ b/mypy/typeshed/stdlib/tracemalloc.pyi
@@ -32,6 +32,7 @@ class Filter(BaseFilter):
     ) -> None: ...
 
 class Statistic:
+    __slots__ = ("traceback", "size", "count")
     count: int
     size: int
     traceback: Traceback
@@ -40,6 +41,7 @@ class Statistic:
     def __hash__(self) -> int: ...
 
 class StatisticDiff:
+    __slots__ = ("traceback", "size", "size_diff", "count", "count_diff")
     count: int
     count_diff: int
     size: int
@@ -52,6 +54,7 @@ class StatisticDiff:
 _FrameTuple: TypeAlias = tuple[str, int]
 
 class Frame:
+    __slots__ = ("_frame",)
     @property
     def filename(self) -> str: ...
     @property
@@ -72,6 +75,7 @@ class Frame:
 _TraceTuple: TypeAlias = tuple[int, int, Sequence[_FrameTuple], int | None] | tuple[int, int, Sequence[_FrameTuple]]
 
 class Trace:
+    __slots__ = ("_trace",)
     @property
     def domain(self) -> int: ...
     @property
@@ -83,6 +87,7 @@ class Trace:
     def __hash__(self) -> int: ...
 
 class Traceback(Sequence[Frame]):
+    __slots__ = ("_frames", "_total_nframe")
     @property
     def total_nframe(self) -> int | None: ...
     def __init__(self, frames: Sequence[_FrameTuple], total_nframe: int | None = None) -> None: ...
diff --git a/mypy/typeshed/stdlib/turtle.pyi b/mypy/typeshed/stdlib/turtle.pyi
index e41476b73b8c..0b93429904c5 100644
--- a/mypy/typeshed/stdlib/turtle.pyi
+++ b/mypy/typeshed/stdlib/turtle.pyi
@@ -4,7 +4,7 @@ from collections.abc import Callable, Generator, Sequence
 from contextlib import contextmanager
 from tkinter import Canvas, Frame, Misc, PhotoImage, Scrollbar
 from typing import Any, ClassVar, Literal, TypedDict, overload, type_check_only
-from typing_extensions import Self, TypeAlias, deprecated
+from typing_extensions import Self, TypeAlias, deprecated, disjoint_base
 
 __all__ = [
     "ScrolledCanvas",
@@ -163,18 +163,34 @@ class _PenState(TypedDict):
 _Speed: TypeAlias = str | float
 _PolygonCoords: TypeAlias = Sequence[tuple[float, float]]
 
-class Vec2D(tuple[float, float]):
-    def __new__(cls, x: float, y: float) -> Self: ...
-    def __add__(self, other: tuple[float, float]) -> Vec2D: ...  # type: ignore[override]
-    @overload  # type: ignore[override]
-    def __mul__(self, other: Vec2D) -> float: ...
-    @overload
-    def __mul__(self, other: float) -> Vec2D: ...
-    def __rmul__(self, other: float) -> Vec2D: ...  # type: ignore[override]
-    def __sub__(self, other: tuple[float, float]) -> Vec2D: ...
-    def __neg__(self) -> Vec2D: ...
-    def __abs__(self) -> float: ...
-    def rotate(self, angle: float) -> Vec2D: ...
+if sys.version_info >= (3, 12):
+    class Vec2D(tuple[float, float]):
+        def __new__(cls, x: float, y: float) -> Self: ...
+        def __add__(self, other: tuple[float, float]) -> Vec2D: ...  # type: ignore[override]
+        @overload  # type: ignore[override]
+        def __mul__(self, other: Vec2D) -> float: ...
+        @overload
+        def __mul__(self, other: float) -> Vec2D: ...
+        def __rmul__(self, other: float) -> Vec2D: ...  # type: ignore[override]
+        def __sub__(self, other: tuple[float, float]) -> Vec2D: ...
+        def __neg__(self) -> Vec2D: ...
+        def __abs__(self) -> float: ...
+        def rotate(self, angle: float) -> Vec2D: ...
+
+else:
+    @disjoint_base
+    class Vec2D(tuple[float, float]):
+        def __new__(cls, x: float, y: float) -> Self: ...
+        def __add__(self, other: tuple[float, float]) -> Vec2D: ...  # type: ignore[override]
+        @overload  # type: ignore[override]
+        def __mul__(self, other: Vec2D) -> float: ...
+        @overload
+        def __mul__(self, other: float) -> Vec2D: ...
+        def __rmul__(self, other: float) -> Vec2D: ...  # type: ignore[override]
+        def __sub__(self, other: tuple[float, float]) -> Vec2D: ...
+        def __neg__(self) -> Vec2D: ...
+        def __abs__(self) -> float: ...
+        def rotate(self, angle: float) -> Vec2D: ...
 
 # Does not actually inherit from Canvas, but dynamically gets all methods of Canvas
 class ScrolledCanvas(Canvas, Frame):  # type: ignore[misc]
diff --git a/mypy/typeshed/stdlib/types.pyi b/mypy/typeshed/stdlib/types.pyi
index 44bd3eeb3f53..591d5da2360d 100644
--- a/mypy/typeshed/stdlib/types.pyi
+++ b/mypy/typeshed/stdlib/types.pyi
@@ -17,7 +17,7 @@ from collections.abc import (
 )
 from importlib.machinery import ModuleSpec
 from typing import Any, ClassVar, Literal, TypeVar, final, overload
-from typing_extensions import ParamSpec, Self, TypeAliasType, TypeVarTuple, deprecated
+from typing_extensions import ParamSpec, Self, TypeAliasType, TypeVarTuple, deprecated, disjoint_base
 
 if sys.version_info >= (3, 14):
     from _typeshed import AnnotateFunc
@@ -151,7 +151,7 @@ class CodeType:
     def co_firstlineno(self) -> int: ...
     if sys.version_info >= (3, 10):
         @property
-        @deprecated("Will be removed in Python 3.15. Use the co_lines() method instead.")
+        @deprecated("Deprecated since Python 3.10; will be removed in Python 3.15. Use `CodeType.co_lines()` instead.")
         def co_lnotab(self) -> bytes: ...
     else:
         @property
@@ -331,20 +331,34 @@ class MappingProxyType(Mapping[_KT, _VT_co]):
     def __or__(self, value: Mapping[_T1, _T2], /) -> dict[_KT | _T1, _VT_co | _T2]: ...
     def __ror__(self, value: Mapping[_T1, _T2], /) -> dict[_KT | _T1, _VT_co | _T2]: ...
 
-class SimpleNamespace:
-    __hash__: ClassVar[None]  # type: ignore[assignment]
-    if sys.version_info >= (3, 13):
-        def __init__(self, mapping_or_iterable: Mapping[str, Any] | Iterable[tuple[str, Any]] = (), /, **kwargs: Any) -> None: ...
-    else:
-        def __init__(self, **kwargs: Any) -> None: ...
+if sys.version_info >= (3, 12):
+    @disjoint_base
+    class SimpleNamespace:
+        __hash__: ClassVar[None]  # type: ignore[assignment]
+        if sys.version_info >= (3, 13):
+            def __init__(
+                self, mapping_or_iterable: Mapping[str, Any] | Iterable[tuple[str, Any]] = (), /, **kwargs: Any
+            ) -> None: ...
+        else:
+            def __init__(self, **kwargs: Any) -> None: ...
 
-    def __eq__(self, value: object, /) -> bool: ...
-    def __getattribute__(self, name: str, /) -> Any: ...
-    def __setattr__(self, name: str, value: Any, /) -> None: ...
-    def __delattr__(self, name: str, /) -> None: ...
-    if sys.version_info >= (3, 13):
-        def __replace__(self, **kwargs: Any) -> Self: ...
+        def __eq__(self, value: object, /) -> bool: ...
+        def __getattribute__(self, name: str, /) -> Any: ...
+        def __setattr__(self, name: str, value: Any, /) -> None: ...
+        def __delattr__(self, name: str, /) -> None: ...
+        if sys.version_info >= (3, 13):
+            def __replace__(self, **kwargs: Any) -> Self: ...
+
+else:
+    class SimpleNamespace:
+        __hash__: ClassVar[None]  # type: ignore[assignment]
+        def __init__(self, **kwargs: Any) -> None: ...
+        def __eq__(self, value: object, /) -> bool: ...
+        def __getattribute__(self, name: str, /) -> Any: ...
+        def __setattr__(self, name: str, value: Any, /) -> None: ...
+        def __delattr__(self, name: str, /) -> None: ...
 
+@disjoint_base
 class ModuleType:
     __name__: str
     __file__: str | None
@@ -661,7 +675,7 @@ _P = ParamSpec("_P")
 def coroutine(func: Callable[_P, Generator[Any, Any, _R]]) -> Callable[_P, Awaitable[_R]]: ...
 @overload
 def coroutine(func: _Fn) -> _Fn: ...
-
+@disjoint_base
 class GenericAlias:
     @property
     def __origin__(self) -> type | TypeAliasType: ...
diff --git a/mypy/typeshed/stdlib/typing.pyi b/mypy/typeshed/stdlib/typing.pyi
index fd9da29addbf..15a5864613d1 100644
--- a/mypy/typeshed/stdlib/typing.pyi
+++ b/mypy/typeshed/stdlib/typing.pyi
@@ -5,7 +5,7 @@ import collections  # noqa: F401  # pyright: ignore[reportUnusedImport]
 import sys
 import typing_extensions
 from _collections_abc import dict_items, dict_keys, dict_values
-from _typeshed import IdentityFunction, ReadableBuffer, SupportsKeysAndGetItem
+from _typeshed import IdentityFunction, ReadableBuffer, SupportsGetItem, SupportsGetItemViewable, SupportsKeysAndGetItem, Viewable
 from abc import ABCMeta, abstractmethod
 from re import Match as Match, Pattern as Pattern
 from types import (
@@ -146,7 +146,9 @@ if sys.version_info >= (3, 13):
 # from _typeshed import AnnotationForm
 
 class Any: ...
-class _Final: ...
+
+class _Final:
+    __slots__ = ("__weakref__",)
 
 def final(f: _T) -> _T: ...
 @final
@@ -229,13 +231,13 @@ _promote = object()
 # N.B. Keep this definition in sync with typing_extensions._SpecialForm
 @final
 class _SpecialForm(_Final):
+    __slots__ = ("_name", "__doc__", "_getitem")
     def __getitem__(self, parameters: Any) -> object: ...
     if sys.version_info >= (3, 10):
         def __or__(self, other: Any) -> _SpecialForm: ...
         def __ror__(self, other: Any) -> _SpecialForm: ...
 
 Union: _SpecialForm
-Generic: _SpecialForm
 Protocol: _SpecialForm
 Callable: _SpecialForm
 Type: _SpecialForm
@@ -440,6 +442,20 @@ Annotated: _SpecialForm
 # Predefined type variables.
 AnyStr = TypeVar("AnyStr", str, bytes)  # noqa: Y001
 
+@type_check_only
+class _Generic:
+    if sys.version_info < (3, 12):
+        __slots__ = ()
+
+    if sys.version_info >= (3, 10):
+        @classmethod
+        def __class_getitem__(cls, args: TypeVar | ParamSpec | tuple[TypeVar | ParamSpec, ...]) -> _Final: ...
+    else:
+        @classmethod
+        def __class_getitem__(cls, args: TypeVar | tuple[TypeVar, ...]) -> _Final: ...
+
+Generic: type[_Generic]
+
 class _ProtocolMeta(ABCMeta):
     if sys.version_info >= (3, 12):
         def __init__(cls, *args: Any, **kwargs: Any) -> None: ...
@@ -449,36 +465,43 @@ class _ProtocolMeta(ABCMeta):
 def runtime_checkable(cls: _TC) -> _TC: ...
 @runtime_checkable
 class SupportsInt(Protocol, metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __int__(self) -> int: ...
 
 @runtime_checkable
 class SupportsFloat(Protocol, metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __float__(self) -> float: ...
 
 @runtime_checkable
 class SupportsComplex(Protocol, metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __complex__(self) -> complex: ...
 
 @runtime_checkable
 class SupportsBytes(Protocol, metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __bytes__(self) -> bytes: ...
 
 @runtime_checkable
 class SupportsIndex(Protocol, metaclass=ABCMeta):
+    __slots__ = ()
     @abstractmethod
     def __index__(self) -> int: ...
 
 @runtime_checkable
 class SupportsAbs(Protocol[_T_co]):
+    __slots__ = ()
     @abstractmethod
     def __abs__(self) -> _T_co: ...
 
 @runtime_checkable
 class SupportsRound(Protocol[_T_co]):
+    __slots__ = ()
     @overload
     @abstractmethod
     def __round__(self) -> int: ...
@@ -703,11 +726,12 @@ class MutableSet(AbstractSet[_T]):
     def __isub__(self, it: AbstractSet[Any]) -> typing_extensions.Self: ...
 
 class MappingView(Sized):
-    def __init__(self, mapping: Mapping[Any, Any]) -> None: ...  # undocumented
+    __slots__ = ("_mapping",)
+    def __init__(self, mapping: Sized) -> None: ...  # undocumented
     def __len__(self) -> int: ...
 
 class ItemsView(MappingView, AbstractSet[tuple[_KT_co, _VT_co]], Generic[_KT_co, _VT_co]):
-    def __init__(self, mapping: Mapping[_KT_co, _VT_co]) -> None: ...  # undocumented
+    def __init__(self, mapping: SupportsGetItemViewable[_KT_co, _VT_co]) -> None: ...  # undocumented
     def __and__(self, other: Iterable[Any]) -> set[tuple[_KT_co, _VT_co]]: ...
     def __rand__(self, other: Iterable[_T]) -> set[_T]: ...
     def __contains__(self, item: tuple[object, object]) -> bool: ...  # type: ignore[override]
@@ -720,7 +744,7 @@ class ItemsView(MappingView, AbstractSet[tuple[_KT_co, _VT_co]], Generic[_KT_co,
     def __rxor__(self, other: Iterable[_T]) -> set[tuple[_KT_co, _VT_co] | _T]: ...
 
 class KeysView(MappingView, AbstractSet[_KT_co]):
-    def __init__(self, mapping: Mapping[_KT_co, Any]) -> None: ...  # undocumented
+    def __init__(self, mapping: Viewable[_KT_co]) -> None: ...  # undocumented
     def __and__(self, other: Iterable[Any]) -> set[_KT_co]: ...
     def __rand__(self, other: Iterable[_T]) -> set[_T]: ...
     def __contains__(self, key: object) -> bool: ...
@@ -733,7 +757,7 @@ class KeysView(MappingView, AbstractSet[_KT_co]):
     def __rxor__(self, other: Iterable[_T]) -> set[_KT_co | _T]: ...
 
 class ValuesView(MappingView, Collection[_VT_co]):
-    def __init__(self, mapping: Mapping[Any, _VT_co]) -> None: ...  # undocumented
+    def __init__(self, mapping: SupportsGetItemViewable[Any, _VT_co]) -> None: ...  # undocumented
     def __contains__(self, value: object) -> bool: ...
     def __iter__(self) -> Iterator[_VT_co]: ...
 
@@ -801,13 +825,13 @@ class MutableMapping(Mapping[_KT, _VT]):
     @overload
     def update(self, m: SupportsKeysAndGetItem[_KT, _VT], /) -> None: ...
     @overload
-    def update(self: Mapping[str, _VT], m: SupportsKeysAndGetItem[str, _VT], /, **kwargs: _VT) -> None: ...
+    def update(self: SupportsGetItem[str, _VT], m: SupportsKeysAndGetItem[str, _VT], /, **kwargs: _VT) -> None: ...
     @overload
     def update(self, m: Iterable[tuple[_KT, _VT]], /) -> None: ...
     @overload
-    def update(self: Mapping[str, _VT], m: Iterable[tuple[str, _VT]], /, **kwargs: _VT) -> None: ...
+    def update(self: SupportsGetItem[str, _VT], m: Iterable[tuple[str, _VT]], /, **kwargs: _VT) -> None: ...
     @overload
-    def update(self: Mapping[str, _VT], **kwargs: _VT) -> None: ...
+    def update(self: SupportsGetItem[str, _VT], **kwargs: _VT) -> None: ...
 
 Text = str
 
@@ -820,6 +844,7 @@ class IO(Generic[AnyStr]):
     # At runtime these are all abstract properties,
     # but making them abstract in the stub is hugely disruptive, for not much gain.
     # See #8726
+    __slots__ = ()
     @property
     def mode(self) -> str: ...
     # Usually str, but may be bytes if a bytes path was passed to open(). See #10737.
@@ -878,11 +903,13 @@ class IO(Generic[AnyStr]):
     ) -> None: ...
 
 class BinaryIO(IO[bytes]):
+    __slots__ = ()
     @abstractmethod
     def __enter__(self) -> BinaryIO: ...
 
 class TextIO(IO[str]):
     # See comment regarding the @properties in the `IO` class
+    __slots__ = ()
     @property
     def buffer(self) -> BinaryIO: ...
     @property
@@ -1045,6 +1072,15 @@ if sys.version_info >= (3, 14):
 else:
     @final
     class ForwardRef(_Final):
+        __slots__ = (
+            "__forward_arg__",
+            "__forward_code__",
+            "__forward_evaluated__",
+            "__forward_value__",
+            "__forward_is_argument__",
+            "__forward_is_class__",
+            "__forward_module__",
+        )
         __forward_arg__: str
         __forward_code__: CodeType
         __forward_evaluated__: bool
diff --git a/mypy/typeshed/stdlib/typing_extensions.pyi b/mypy/typeshed/stdlib/typing_extensions.pyi
index 71bf3d87d499..f5ea13f67733 100644
--- a/mypy/typeshed/stdlib/typing_extensions.pyi
+++ b/mypy/typeshed/stdlib/typing_extensions.pyi
@@ -120,6 +120,7 @@ __all__ = [
     "clear_overloads",
     "dataclass_transform",
     "deprecated",
+    "disjoint_base",
     "Doc",
     "evaluate_forward_ref",
     "get_overloads",
@@ -150,6 +151,7 @@ __all__ = [
     "TypeGuard",
     "TypeIs",
     "TYPE_CHECKING",
+    "type_repr",
     "Never",
     "NoReturn",
     "ReadOnly",
@@ -219,6 +221,7 @@ runtime = runtime_checkable
 Final: _SpecialForm
 
 def final(f: _F) -> _F: ...
+def disjoint_base(cls: _TC) -> _TC: ...
 
 Literal: _SpecialForm
 
@@ -405,36 +408,43 @@ else:
 
     @runtime_checkable
     class SupportsInt(Protocol, metaclass=abc.ABCMeta):
+        __slots__ = ()
         @abc.abstractmethod
         def __int__(self) -> int: ...
 
     @runtime_checkable
     class SupportsFloat(Protocol, metaclass=abc.ABCMeta):
+        __slots__ = ()
         @abc.abstractmethod
         def __float__(self) -> float: ...
 
     @runtime_checkable
     class SupportsComplex(Protocol, metaclass=abc.ABCMeta):
+        __slots__ = ()
         @abc.abstractmethod
         def __complex__(self) -> complex: ...
 
     @runtime_checkable
     class SupportsBytes(Protocol, metaclass=abc.ABCMeta):
+        __slots__ = ()
         @abc.abstractmethod
         def __bytes__(self) -> bytes: ...
 
     @runtime_checkable
     class SupportsIndex(Protocol, metaclass=abc.ABCMeta):
+        __slots__ = ()
         @abc.abstractmethod
         def __index__(self) -> int: ...
 
     @runtime_checkable
     class SupportsAbs(Protocol[_T_co]):
+        __slots__ = ()
         @abc.abstractmethod
         def __abs__(self) -> _T_co: ...
 
     @runtime_checkable
     class SupportsRound(Protocol[_T_co]):
+        __slots__ = ()
         @overload
         @abc.abstractmethod
         def __round__(self) -> int: ...
@@ -447,11 +457,13 @@ if sys.version_info >= (3, 14):
 else:
     @runtime_checkable
     class Reader(Protocol[_T_co]):
+        __slots__ = ()
         @abc.abstractmethod
         def read(self, size: int = ..., /) -> _T_co: ...
 
     @runtime_checkable
     class Writer(Protocol[_T_contra]):
+        __slots__ = ()
         @abc.abstractmethod
         def write(self, data: _T_contra, /) -> int: ...
 
@@ -616,7 +628,7 @@ TypeForm: _SpecialForm
 if sys.version_info >= (3, 14):
     from typing import evaluate_forward_ref as evaluate_forward_ref
 
-    from annotationlib import Format as Format, get_annotations as get_annotations
+    from annotationlib import Format as Format, get_annotations as get_annotations, type_repr as type_repr
 else:
     class Format(enum.IntEnum):
         VALUE = 1
@@ -684,6 +696,7 @@ else:
         format: Format | None = None,
         _recursive_guard: Container[str] = ...,
     ) -> AnnotationForm: ...
+    def type_repr(value: object) -> str: ...
 
 # PEP 661
 class Sentinel:
diff --git a/mypy/typeshed/stdlib/unicodedata.pyi b/mypy/typeshed/stdlib/unicodedata.pyi
index 77d69edf06af..9fff042f0b96 100644
--- a/mypy/typeshed/stdlib/unicodedata.pyi
+++ b/mypy/typeshed/stdlib/unicodedata.pyi
@@ -1,10 +1,10 @@
 import sys
 from _typeshed import ReadOnlyBuffer
-from typing import Any, Literal, TypeVar, final, overload
+from typing import Any, Final, Literal, TypeVar, final, overload
 from typing_extensions import TypeAlias
 
 ucd_3_2_0: UCD
-unidata_version: str
+unidata_version: Final[str]
 
 if sys.version_info < (3, 10):
     ucnhash_CAPI: Any
diff --git a/mypy/typeshed/stdlib/unittest/loader.pyi b/mypy/typeshed/stdlib/unittest/loader.pyi
index 598e3cd84a5e..81de40c89849 100644
--- a/mypy/typeshed/stdlib/unittest/loader.pyi
+++ b/mypy/typeshed/stdlib/unittest/loader.pyi
@@ -35,21 +35,38 @@ class TestLoader:
 defaultTestLoader: TestLoader
 
 if sys.version_info < (3, 13):
-    @deprecated("Deprecated in Python 3.11; removal scheduled for Python 3.13")
-    def getTestCaseNames(
-        testCaseClass: type[unittest.case.TestCase],
-        prefix: str,
-        sortUsing: _SortComparisonMethod = ...,
-        testNamePatterns: list[str] | None = None,
-    ) -> Sequence[str]: ...
-    @deprecated("Deprecated in Python 3.11; removal scheduled for Python 3.13")
-    def makeSuite(
-        testCaseClass: type[unittest.case.TestCase],
-        prefix: str = "test",
-        sortUsing: _SortComparisonMethod = ...,
-        suiteClass: _SuiteClass = ...,
-    ) -> unittest.suite.TestSuite: ...
-    @deprecated("Deprecated in Python 3.11; removal scheduled for Python 3.13")
-    def findTestCases(
-        module: ModuleType, prefix: str = "test", sortUsing: _SortComparisonMethod = ..., suiteClass: _SuiteClass = ...
-    ) -> unittest.suite.TestSuite: ...
+    if sys.version_info >= (3, 11):
+        @deprecated("Deprecated since Python 3.11; removed in Python 3.13.")
+        def getTestCaseNames(
+            testCaseClass: type[unittest.case.TestCase],
+            prefix: str,
+            sortUsing: _SortComparisonMethod = ...,
+            testNamePatterns: list[str] | None = None,
+        ) -> Sequence[str]: ...
+        @deprecated("Deprecated since Python 3.11; removed in Python 3.13.")
+        def makeSuite(
+            testCaseClass: type[unittest.case.TestCase],
+            prefix: str = "test",
+            sortUsing: _SortComparisonMethod = ...,
+            suiteClass: _SuiteClass = ...,
+        ) -> unittest.suite.TestSuite: ...
+        @deprecated("Deprecated since Python 3.11; removed in Python 3.13.")
+        def findTestCases(
+            module: ModuleType, prefix: str = "test", sortUsing: _SortComparisonMethod = ..., suiteClass: _SuiteClass = ...
+        ) -> unittest.suite.TestSuite: ...
+    else:
+        def getTestCaseNames(
+            testCaseClass: type[unittest.case.TestCase],
+            prefix: str,
+            sortUsing: _SortComparisonMethod = ...,
+            testNamePatterns: list[str] | None = None,
+        ) -> Sequence[str]: ...
+        def makeSuite(
+            testCaseClass: type[unittest.case.TestCase],
+            prefix: str = "test",
+            sortUsing: _SortComparisonMethod = ...,
+            suiteClass: _SuiteClass = ...,
+        ) -> unittest.suite.TestSuite: ...
+        def findTestCases(
+            module: ModuleType, prefix: str = "test", sortUsing: _SortComparisonMethod = ..., suiteClass: _SuiteClass = ...
+        ) -> unittest.suite.TestSuite: ...
diff --git a/mypy/typeshed/stdlib/unittest/main.pyi b/mypy/typeshed/stdlib/unittest/main.pyi
index 152e9c33209c..23ead1638ecc 100644
--- a/mypy/typeshed/stdlib/unittest/main.pyi
+++ b/mypy/typeshed/stdlib/unittest/main.pyi
@@ -64,8 +64,11 @@ class TestProgram:
         ) -> None: ...
 
     if sys.version_info < (3, 13):
-        @deprecated("Deprecated in Python 3.11; removal scheduled for Python 3.13")
-        def usageExit(self, msg: Any = None) -> None: ...
+        if sys.version_info >= (3, 11):
+            @deprecated("Deprecated since Python 3.11; removed in Python 3.13.")
+            def usageExit(self, msg: Any = None) -> None: ...
+        else:
+            def usageExit(self, msg: Any = None) -> None: ...
 
     def parseArgs(self, argv: list[str]) -> None: ...
     def createTests(self, from_discovery: bool = False, Loader: unittest.loader.TestLoader | None = None) -> None: ...
diff --git a/mypy/typeshed/stdlib/unittest/mock.pyi b/mypy/typeshed/stdlib/unittest/mock.pyi
index 6b0941a91719..f4b59e7cab90 100644
--- a/mypy/typeshed/stdlib/unittest/mock.pyi
+++ b/mypy/typeshed/stdlib/unittest/mock.pyi
@@ -4,7 +4,7 @@ from collections.abc import Awaitable, Callable, Coroutine, Iterable, Mapping, S
 from contextlib import _GeneratorContextManager
 from types import TracebackType
 from typing import Any, ClassVar, Final, Generic, Literal, TypeVar, overload, type_check_only
-from typing_extensions import ParamSpec, Self, TypeAlias
+from typing_extensions import ParamSpec, Self, TypeAlias, disjoint_base
 
 _T = TypeVar("_T")
 _TT = TypeVar("_TT", bound=type[Any])
@@ -52,7 +52,7 @@ else:
         "seal",
     )
 
-FILTER_DIR: Any
+FILTER_DIR: bool  # controls the way mock objects respond to `dir` function
 
 class _SentinelObject:
     name: Any
@@ -61,36 +61,73 @@ class _SentinelObject:
 class _Sentinel:
     def __getattr__(self, name: str) -> Any: ...
 
-sentinel: Any
+sentinel: _Sentinel
 DEFAULT: Any
 
 _ArgsKwargs: TypeAlias = tuple[tuple[Any, ...], Mapping[str, Any]]
 _NameArgsKwargs: TypeAlias = tuple[str, tuple[Any, ...], Mapping[str, Any]]
 _CallValue: TypeAlias = str | tuple[Any, ...] | Mapping[str, Any] | _ArgsKwargs | _NameArgsKwargs
 
-class _Call(tuple[Any, ...]):
-    def __new__(
-        cls, value: _CallValue = (), name: str | None = "", parent: _Call | None = None, two: bool = False, from_kall: bool = True
-    ) -> Self: ...
-    def __init__(
-        self,
-        value: _CallValue = (),
-        name: str | None = None,
-        parent: _Call | None = None,
-        two: bool = False,
-        from_kall: bool = True,
-    ) -> None: ...
-    __hash__: ClassVar[None]  # type: ignore[assignment]
-    def __eq__(self, other: object) -> bool: ...
-    def __ne__(self, value: object, /) -> bool: ...
-    def __call__(self, *args: Any, **kwargs: Any) -> _Call: ...
-    def __getattr__(self, attr: str) -> Any: ...
-    def __getattribute__(self, attr: str) -> Any: ...
-    @property
-    def args(self) -> tuple[Any, ...]: ...
-    @property
-    def kwargs(self) -> Mapping[str, Any]: ...
-    def call_list(self) -> Any: ...
+if sys.version_info >= (3, 12):
+    class _Call(tuple[Any, ...]):
+        def __new__(
+            cls,
+            value: _CallValue = (),
+            name: str | None = "",
+            parent: _Call | None = None,
+            two: bool = False,
+            from_kall: bool = True,
+        ) -> Self: ...
+        def __init__(
+            self,
+            value: _CallValue = (),
+            name: str | None = None,
+            parent: _Call | None = None,
+            two: bool = False,
+            from_kall: bool = True,
+        ) -> None: ...
+        __hash__: ClassVar[None]  # type: ignore[assignment]
+        def __eq__(self, other: object) -> bool: ...
+        def __ne__(self, value: object, /) -> bool: ...
+        def __call__(self, *args: Any, **kwargs: Any) -> _Call: ...
+        def __getattr__(self, attr: str) -> Any: ...
+        def __getattribute__(self, attr: str) -> Any: ...
+        @property
+        def args(self) -> tuple[Any, ...]: ...
+        @property
+        def kwargs(self) -> Mapping[str, Any]: ...
+        def call_list(self) -> Any: ...
+
+else:
+    @disjoint_base
+    class _Call(tuple[Any, ...]):
+        def __new__(
+            cls,
+            value: _CallValue = (),
+            name: str | None = "",
+            parent: _Call | None = None,
+            two: bool = False,
+            from_kall: bool = True,
+        ) -> Self: ...
+        def __init__(
+            self,
+            value: _CallValue = (),
+            name: str | None = None,
+            parent: _Call | None = None,
+            two: bool = False,
+            from_kall: bool = True,
+        ) -> None: ...
+        __hash__: ClassVar[None]  # type: ignore[assignment]
+        def __eq__(self, other: object) -> bool: ...
+        def __ne__(self, value: object, /) -> bool: ...
+        def __call__(self, *args: Any, **kwargs: Any) -> _Call: ...
+        def __getattr__(self, attr: str) -> Any: ...
+        def __getattribute__(self, attr: str) -> Any: ...
+        @property
+        def args(self) -> tuple[Any, ...]: ...
+        @property
+        def kwargs(self) -> Mapping[str, Any]: ...
+        def call_list(self) -> Any: ...
 
 call: _Call
 
@@ -297,27 +334,32 @@ class _patcher:
     # Ideally we'd be able to add an overload for it so that the return type is _patch[MagicMock],
     # but that's impossible with the current type system.
     @overload
-    def __call__(
+    def __call__(  # type: ignore[overload-overlap]
         self,
         target: str,
         new: _T,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
-        new_callable: Callable[..., Any] | None = ...,
-        **kwargs: Any,
+        spec: Literal[False] | None = None,
+        create: bool = False,
+        spec_set: Literal[False] | None = None,
+        autospec: Literal[False] | None = None,
+        new_callable: None = None,
+        *,
+        unsafe: bool = False,
     ) -> _patch[_T]: ...
     @overload
     def __call__(
         self,
         target: str,
         *,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
+        # If not False or None, this is passed to new_callable
+        spec: Any | Literal[False] | None = None,
+        create: bool = False,
+        # If not False or None, this is passed to new_callable
+        spec_set: Any | Literal[False] | None = None,
+        autospec: Literal[False] | None = None,
         new_callable: Callable[..., _T],
+        unsafe: bool = False,
+        # kwargs are passed to new_callable
         **kwargs: Any,
     ) -> _patch_pass_arg[_T]: ...
     @overload
@@ -325,25 +367,31 @@ class _patcher:
         self,
         target: str,
         *,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
-        new_callable: None = ...,
+        spec: Any | bool | None = None,
+        create: bool = False,
+        spec_set: Any | bool | None = None,
+        autospec: Any | bool | None = None,
+        new_callable: None = None,
+        unsafe: bool = False,
+        # kwargs are passed to the MagicMock/AsyncMock constructor
         **kwargs: Any,
     ) -> _patch_pass_arg[MagicMock | AsyncMock]: ...
+    # This overload also covers the case, where new==DEFAULT. In this case, the return type is _patch[Any].
+    # Ideally we'd be able to add an overload for it so that the return type is _patch[MagicMock],
+    # but that's impossible with the current type system.
     @overload
     @staticmethod
     def object(
         target: Any,
         attribute: str,
         new: _T,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
-        new_callable: Callable[..., Any] | None = ...,
-        **kwargs: Any,
+        spec: Literal[False] | None = None,
+        create: bool = False,
+        spec_set: Literal[False] | None = None,
+        autospec: Literal[False] | None = None,
+        new_callable: None = None,
+        *,
+        unsafe: bool = False,
     ) -> _patch[_T]: ...
     @overload
     @staticmethod
@@ -351,11 +399,15 @@ class _patcher:
         target: Any,
         attribute: str,
         *,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
+        # If not False or None, this is passed to new_callable
+        spec: Any | Literal[False] | None = None,
+        create: bool = False,
+        # If not False or None, this is passed to new_callable
+        spec_set: Any | Literal[False] | None = None,
+        autospec: Literal[False] | None = None,
         new_callable: Callable[..., _T],
+        unsafe: bool = False,
+        # kwargs are passed to new_callable
         **kwargs: Any,
     ) -> _patch_pass_arg[_T]: ...
     @overload
@@ -364,21 +416,54 @@ class _patcher:
         target: Any,
         attribute: str,
         *,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
-        new_callable: None = ...,
+        spec: Any | bool | None = None,
+        create: bool = False,
+        spec_set: Any | bool | None = None,
+        autospec: Any | bool | None = None,
+        new_callable: None = None,
+        unsafe: bool = False,
+        # kwargs are passed to the MagicMock/AsyncMock constructor
         **kwargs: Any,
     ) -> _patch_pass_arg[MagicMock | AsyncMock]: ...
+    @overload
     @staticmethod
     def multiple(
-        target: Any,
-        spec: Any | None = ...,
-        create: bool = ...,
-        spec_set: Any | None = ...,
-        autospec: Any | None = ...,
-        new_callable: Any | None = ...,
+        target: Any | str,
+        # If not False or None, this is passed to new_callable
+        spec: Any | Literal[False] | None = None,
+        create: bool = False,
+        # If not False or None, this is passed to new_callable
+        spec_set: Any | Literal[False] | None = None,
+        autospec: Literal[False] | None = None,
+        *,
+        new_callable: Callable[..., _T],
+        # The kwargs must be DEFAULT
+        **kwargs: Any,
+    ) -> _patch_pass_arg[_T]: ...
+    @overload
+    @staticmethod
+    def multiple(
+        target: Any | str,
+        # If not False or None, this is passed to new_callable
+        spec: Any | Literal[False] | None,
+        create: bool,
+        # If not False or None, this is passed to new_callable
+        spec_set: Any | Literal[False] | None,
+        autospec: Literal[False] | None,
+        new_callable: Callable[..., _T],
+        # The kwargs must be DEFAULT
+        **kwargs: Any,
+    ) -> _patch_pass_arg[_T]: ...
+    @overload
+    @staticmethod
+    def multiple(
+        target: Any | str,
+        spec: Any | bool | None = None,
+        create: bool = False,
+        spec_set: Any | bool | None = None,
+        autospec: Any | bool | None = None,
+        new_callable: None = None,
+        # The kwargs are the mock objects or DEFAULT
         **kwargs: Any,
     ) -> _patch[Any]: ...
     @staticmethod
@@ -428,7 +513,7 @@ class _ANY:
     def __ne__(self, other: object) -> Literal[False]: ...
     __hash__: ClassVar[None]  # type: ignore[assignment]
 
-ANY: Any
+ANY: _ANY
 
 if sys.version_info >= (3, 10):
     def create_autospec(
diff --git a/mypy/typeshed/stdlib/unittest/util.pyi b/mypy/typeshed/stdlib/unittest/util.pyi
index 945b0cecfed0..31c830e8268a 100644
--- a/mypy/typeshed/stdlib/unittest/util.pyi
+++ b/mypy/typeshed/stdlib/unittest/util.pyi
@@ -5,12 +5,12 @@ from typing_extensions import TypeAlias
 _T = TypeVar("_T")
 _Mismatch: TypeAlias = tuple[_T, _T, int]
 
-_MAX_LENGTH: Final[int]
-_PLACEHOLDER_LEN: Final[int]
-_MIN_BEGIN_LEN: Final[int]
-_MIN_END_LEN: Final[int]
-_MIN_COMMON_LEN: Final[int]
-_MIN_DIFF_LEN: Final[int]
+_MAX_LENGTH: Final = 80
+_PLACEHOLDER_LEN: Final = 12
+_MIN_BEGIN_LEN: Final = 5
+_MIN_END_LEN: Final = 5
+_MIN_COMMON_LEN: Final = 5
+_MIN_DIFF_LEN: Final = 41
 
 def _shorten(s: str, prefixlen: int, suffixlen: int) -> str: ...
 def _common_shorten_repr(*args: str) -> tuple[str, ...]: ...
diff --git a/mypy/typeshed/stdlib/urllib/parse.pyi b/mypy/typeshed/stdlib/urllib/parse.pyi
index a5ed616d25af..364892ecdf69 100644
--- a/mypy/typeshed/stdlib/urllib/parse.pyi
+++ b/mypy/typeshed/stdlib/urllib/parse.pyi
@@ -1,7 +1,7 @@
 import sys
 from collections.abc import Iterable, Mapping, Sequence
 from types import GenericAlias
-from typing import Any, AnyStr, Generic, Literal, NamedTuple, Protocol, overload, type_check_only
+from typing import Any, AnyStr, Final, Generic, Literal, NamedTuple, Protocol, overload, type_check_only
 from typing_extensions import TypeAlias
 
 __all__ = [
@@ -28,23 +28,26 @@ __all__ = [
     "SplitResultBytes",
 ]
 
-uses_relative: list[str]
-uses_netloc: list[str]
-uses_params: list[str]
-non_hierarchical: list[str]
-uses_query: list[str]
-uses_fragment: list[str]
-scheme_chars: str
+uses_relative: Final[list[str]]
+uses_netloc: Final[list[str]]
+uses_params: Final[list[str]]
+non_hierarchical: Final[list[str]]
+uses_query: Final[list[str]]
+uses_fragment: Final[list[str]]
+scheme_chars: Final[str]
 if sys.version_info < (3, 11):
-    MAX_CACHE_SIZE: int
+    MAX_CACHE_SIZE: Final[int]
 
 class _ResultMixinStr:
+    __slots__ = ()
     def encode(self, encoding: str = "ascii", errors: str = "strict") -> _ResultMixinBytes: ...
 
 class _ResultMixinBytes:
+    __slots__ = ()
     def decode(self, encoding: str = "ascii", errors: str = "strict") -> _ResultMixinStr: ...
 
 class _NetlocResultMixinBase(Generic[AnyStr]):
+    __slots__ = ()
     @property
     def username(self) -> AnyStr | None: ...
     @property
@@ -55,8 +58,11 @@ class _NetlocResultMixinBase(Generic[AnyStr]):
     def port(self) -> int | None: ...
     def __class_getitem__(cls, item: Any, /) -> GenericAlias: ...
 
-class _NetlocResultMixinStr(_NetlocResultMixinBase[str], _ResultMixinStr): ...
-class _NetlocResultMixinBytes(_NetlocResultMixinBase[bytes], _ResultMixinBytes): ...
+class _NetlocResultMixinStr(_NetlocResultMixinBase[str], _ResultMixinStr):
+    __slots__ = ()
+
+class _NetlocResultMixinBytes(_NetlocResultMixinBase[bytes], _ResultMixinBytes):
+    __slots__ = ()
 
 class _DefragResultBase(NamedTuple, Generic[AnyStr]):
     url: AnyStr
diff --git a/mypy/typeshed/stdlib/uuid.pyi b/mypy/typeshed/stdlib/uuid.pyi
index 0aa2f76d40cc..303fb10eaf53 100644
--- a/mypy/typeshed/stdlib/uuid.pyi
+++ b/mypy/typeshed/stdlib/uuid.pyi
@@ -12,6 +12,7 @@ class SafeUUID(Enum):
     unknown = None
 
 class UUID:
+    __slots__ = ("int", "is_safe", "__weakref__")
     def __init__(
         self,
         hex: str | None = None,
diff --git a/mypy/typeshed/stdlib/venv/__init__.pyi b/mypy/typeshed/stdlib/venv/__init__.pyi
index 0f71f0e073f5..14db88523dba 100644
--- a/mypy/typeshed/stdlib/venv/__init__.pyi
+++ b/mypy/typeshed/stdlib/venv/__init__.pyi
@@ -3,10 +3,11 @@ import sys
 from _typeshed import StrOrBytesPath
 from collections.abc import Iterable, Sequence
 from types import SimpleNamespace
+from typing import Final
 
 logger: logging.Logger
 
-CORE_VENV_DEPS: tuple[str, ...]
+CORE_VENV_DEPS: Final[tuple[str, ...]]
 
 class EnvBuilder:
     system_site_packages: bool
diff --git a/mypy/typeshed/stdlib/wave.pyi b/mypy/typeshed/stdlib/wave.pyi
index ddc6f6bd02a5..fd7dbfade884 100644
--- a/mypy/typeshed/stdlib/wave.pyi
+++ b/mypy/typeshed/stdlib/wave.pyi
@@ -1,3 +1,4 @@
+import sys
 from _typeshed import ReadableBuffer, Unused
 from typing import IO, Any, BinaryIO, Final, Literal, NamedTuple, NoReturn, overload
 from typing_extensions import Self, TypeAlias, deprecated
@@ -8,7 +9,7 @@ _File: TypeAlias = str | IO[bytes]
 
 class Error(Exception): ...
 
-WAVE_FORMAT_PCM: Final = 1
+WAVE_FORMAT_PCM: Final = 0x0001
 
 class _wave_params(NamedTuple):
     nchannels: int
@@ -34,10 +35,15 @@ class Wave_read:
     def getcomptype(self) -> str: ...
     def getcompname(self) -> str: ...
     def getparams(self) -> _wave_params: ...
-    @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-    def getmarkers(self) -> None: ...
-    @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-    def getmark(self, id: Any) -> NoReturn: ...
+    if sys.version_info >= (3, 13):
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+        def getmarkers(self) -> None: ...
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+        def getmark(self, id: Any) -> NoReturn: ...
+    else:
+        def getmarkers(self) -> None: ...
+        def getmark(self, id: Any) -> NoReturn: ...
+
     def setpos(self, pos: int) -> None: ...
     def readframes(self, nframes: int) -> bytes: ...
 
@@ -59,12 +65,18 @@ class Wave_write:
     def getcompname(self) -> str: ...
     def setparams(self, params: _wave_params | tuple[int, int, int, int, str, str]) -> None: ...
     def getparams(self) -> _wave_params: ...
-    @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-    def setmark(self, id: Any, pos: Any, name: Any) -> NoReturn: ...
-    @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-    def getmark(self, id: Any) -> NoReturn: ...
-    @deprecated("Deprecated in Python 3.13; removal scheduled for Python 3.15")
-    def getmarkers(self) -> None: ...
+    if sys.version_info >= (3, 13):
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+        def setmark(self, id: Any, pos: Any, name: Any) -> NoReturn: ...
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+        def getmark(self, id: Any) -> NoReturn: ...
+        @deprecated("Deprecated since Python 3.13; will be removed in Python 3.15.")
+        def getmarkers(self) -> None: ...
+    else:
+        def setmark(self, id: Any, pos: Any, name: Any) -> NoReturn: ...
+        def getmark(self, id: Any) -> NoReturn: ...
+        def getmarkers(self) -> None: ...
+
     def tell(self) -> int: ...
     def writeframesraw(self, data: ReadableBuffer) -> None: ...
     def writeframes(self, data: ReadableBuffer) -> None: ...
diff --git a/mypy/typeshed/stdlib/weakref.pyi b/mypy/typeshed/stdlib/weakref.pyi
index 334fab7e7468..76ab86b957a1 100644
--- a/mypy/typeshed/stdlib/weakref.pyi
+++ b/mypy/typeshed/stdlib/weakref.pyi
@@ -4,7 +4,7 @@ from _weakrefset import WeakSet as WeakSet
 from collections.abc import Callable, Iterable, Iterator, Mapping, MutableMapping
 from types import GenericAlias
 from typing import Any, ClassVar, Generic, TypeVar, final, overload
-from typing_extensions import ParamSpec, Self
+from typing_extensions import ParamSpec, Self, disjoint_base
 
 __all__ = [
     "ref",
@@ -52,6 +52,7 @@ class ProxyType(Generic[_T]):  # "weakproxy"
     def __getattr__(self, attr: str) -> Any: ...
     __hash__: ClassVar[None]  # type: ignore[assignment]
 
+@disjoint_base
 class ReferenceType(Generic[_T]):  # "weakref"
     __callback__: Callable[[Self], Any]
     def __new__(cls, o: _T, callback: Callable[[Self], Any] | None = ..., /) -> Self: ...
@@ -65,6 +66,7 @@ ref = ReferenceType
 # everything below here is implemented in weakref.py
 
 class WeakMethod(ref[_CallableT]):
+    __slots__ = ("_func_ref", "_meth_type", "_alive", "__weakref__")
     def __new__(cls, meth: _CallableT, callback: Callable[[Self], Any] | None = None) -> Self: ...
     def __call__(self) -> _CallableT | None: ...
     def __eq__(self, other: object) -> bool: ...
@@ -130,6 +132,7 @@ class WeakValueDictionary(MutableMapping[_KT, _VT]):
     def __ior__(self, other: Iterable[tuple[_KT, _VT]]) -> Self: ...
 
 class KeyedRef(ref[_T], Generic[_KT, _T]):
+    __slots__ = ("key",)
     key: _KT
     def __new__(type, ob: _T, callback: Callable[[Self], Any], key: _KT) -> Self: ...
     def __init__(self, ob: _T, callback: Callable[[Self], Any], key: _KT) -> None: ...
@@ -185,6 +188,7 @@ class WeakKeyDictionary(MutableMapping[_KT, _VT]):
     def __ior__(self, other: Iterable[tuple[_KT, _VT]]) -> Self: ...
 
 class finalize(Generic[_P, _T]):
+    __slots__ = ()
     def __init__(self, obj: _T, func: Callable[_P, Any], /, *args: _P.args, **kwargs: _P.kwargs) -> None: ...
     def __call__(self, _: Any = None) -> Any | None: ...
     def detach(self) -> tuple[_T, Callable[_P, Any], tuple[Any, ...], dict[str, Any]] | None: ...
diff --git a/mypy/typeshed/stdlib/webbrowser.pyi b/mypy/typeshed/stdlib/webbrowser.pyi
index 773786c24821..56c30f872727 100644
--- a/mypy/typeshed/stdlib/webbrowser.pyi
+++ b/mypy/typeshed/stdlib/webbrowser.pyi
@@ -64,10 +64,16 @@ if sys.platform == "win32":
 
 if sys.platform == "darwin":
     if sys.version_info < (3, 13):
-        @deprecated("Deprecated in 3.11, to be removed in 3.13.")
-        class MacOSX(BaseBrowser):
-            def __init__(self, name: str) -> None: ...
-            def open(self, url: str, new: int = 0, autoraise: bool = True) -> bool: ...
+        if sys.version_info >= (3, 11):
+            @deprecated("Deprecated since Python 3.11; removed in Python 3.13.")
+            class MacOSX(BaseBrowser):
+                def __init__(self, name: str) -> None: ...
+                def open(self, url: str, new: int = 0, autoraise: bool = True) -> bool: ...
+
+        else:
+            class MacOSX(BaseBrowser):
+                def __init__(self, name: str) -> None: ...
+                def open(self, url: str, new: int = 0, autoraise: bool = True) -> bool: ...
 
     class MacOSXOSAScript(BaseBrowser):  # In runtime this class does not have `name` and `basename`
         if sys.version_info >= (3, 11):
diff --git a/mypy/typeshed/stdlib/winreg.pyi b/mypy/typeshed/stdlib/winreg.pyi
index 0a22bb23d8f6..53457112ee96 100644
--- a/mypy/typeshed/stdlib/winreg.pyi
+++ b/mypy/typeshed/stdlib/winreg.pyi
@@ -59,13 +59,13 @@ if sys.platform == "win32":
     def EnableReflectionKey(key: _KeyType, /) -> None: ...
     def QueryReflectionKey(key: _KeyType, /) -> bool: ...
 
-    HKEY_CLASSES_ROOT: int
-    HKEY_CURRENT_USER: int
-    HKEY_LOCAL_MACHINE: int
-    HKEY_USERS: int
-    HKEY_PERFORMANCE_DATA: int
-    HKEY_CURRENT_CONFIG: int
-    HKEY_DYN_DATA: int
+    HKEY_CLASSES_ROOT: Final[int]
+    HKEY_CURRENT_USER: Final[int]
+    HKEY_LOCAL_MACHINE: Final[int]
+    HKEY_USERS: Final[int]
+    HKEY_PERFORMANCE_DATA: Final[int]
+    HKEY_CURRENT_CONFIG: Final[int]
+    HKEY_DYN_DATA: Final[int]
 
     KEY_ALL_ACCESS: Final = 983103
     KEY_WRITE: Final = 131078
diff --git a/mypy/typeshed/stdlib/wsgiref/headers.pyi b/mypy/typeshed/stdlib/wsgiref/headers.pyi
index 2654d79bf4e5..9febad4b3277 100644
--- a/mypy/typeshed/stdlib/wsgiref/headers.pyi
+++ b/mypy/typeshed/stdlib/wsgiref/headers.pyi
@@ -1,10 +1,10 @@
 from re import Pattern
-from typing import overload
+from typing import Final, overload
 from typing_extensions import TypeAlias
 
 _HeaderList: TypeAlias = list[tuple[str, str]]
 
-tspecials: Pattern[str]  # undocumented
+tspecials: Final[Pattern[str]]  # undocumented
 
 class Headers:
     def __init__(self, headers: _HeaderList | None = None) -> None: ...
diff --git a/mypy/typeshed/stdlib/wsgiref/simple_server.pyi b/mypy/typeshed/stdlib/wsgiref/simple_server.pyi
index 547f562cc1d4..bdf58719c828 100644
--- a/mypy/typeshed/stdlib/wsgiref/simple_server.pyi
+++ b/mypy/typeshed/stdlib/wsgiref/simple_server.pyi
@@ -1,14 +1,14 @@
 from _typeshed.wsgi import ErrorStream, StartResponse, WSGIApplication, WSGIEnvironment
 from http.server import BaseHTTPRequestHandler, HTTPServer
-from typing import TypeVar, overload
+from typing import Final, TypeVar, overload
 
 from .handlers import SimpleHandler
 
 __all__ = ["WSGIServer", "WSGIRequestHandler", "demo_app", "make_server"]
 
-server_version: str  # undocumented
-sys_version: str  # undocumented
-software_version: str  # undocumented
+server_version: Final[str]  # undocumented
+sys_version: Final[str]  # undocumented
+software_version: Final[str]  # undocumented
 
 class ServerHandler(SimpleHandler):  # undocumented
     server_software: str
diff --git a/mypy/typeshed/stdlib/xml/dom/NodeFilter.pyi b/mypy/typeshed/stdlib/xml/dom/NodeFilter.pyi
index 007df982e06a..7b301373f528 100644
--- a/mypy/typeshed/stdlib/xml/dom/NodeFilter.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/NodeFilter.pyi
@@ -1,22 +1,22 @@
-from typing import Literal
+from typing import Final
 from xml.dom.minidom import Node
 
 class NodeFilter:
-    FILTER_ACCEPT: Literal[1]
-    FILTER_REJECT: Literal[2]
-    FILTER_SKIP: Literal[3]
+    FILTER_ACCEPT: Final = 1
+    FILTER_REJECT: Final = 2
+    FILTER_SKIP: Final = 3
 
-    SHOW_ALL: int
-    SHOW_ELEMENT: int
-    SHOW_ATTRIBUTE: int
-    SHOW_TEXT: int
-    SHOW_CDATA_SECTION: int
-    SHOW_ENTITY_REFERENCE: int
-    SHOW_ENTITY: int
-    SHOW_PROCESSING_INSTRUCTION: int
-    SHOW_COMMENT: int
-    SHOW_DOCUMENT: int
-    SHOW_DOCUMENT_TYPE: int
-    SHOW_DOCUMENT_FRAGMENT: int
-    SHOW_NOTATION: int
+    SHOW_ALL: Final = 0xFFFFFFFF
+    SHOW_ELEMENT: Final = 0x00000001
+    SHOW_ATTRIBUTE: Final = 0x00000002
+    SHOW_TEXT: Final = 0x00000004
+    SHOW_CDATA_SECTION: Final = 0x00000008
+    SHOW_ENTITY_REFERENCE: Final = 0x00000010
+    SHOW_ENTITY: Final = 0x00000020
+    SHOW_PROCESSING_INSTRUCTION: Final = 0x00000040
+    SHOW_COMMENT: Final = 0x00000080
+    SHOW_DOCUMENT: Final = 0x00000100
+    SHOW_DOCUMENT_TYPE: Final = 0x00000200
+    SHOW_DOCUMENT_FRAGMENT: Final = 0x00000400
+    SHOW_NOTATION: Final = 0x00000800
     def acceptNode(self, node: Node) -> int: ...
diff --git a/mypy/typeshed/stdlib/xml/dom/__init__.pyi b/mypy/typeshed/stdlib/xml/dom/__init__.pyi
index d9615f9aacfe..5dbb6c536f61 100644
--- a/mypy/typeshed/stdlib/xml/dom/__init__.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/__init__.pyi
@@ -3,18 +3,19 @@ from typing import Any, Final, Literal
 from .domreg import getDOMImplementation as getDOMImplementation, registerDOMImplementation as registerDOMImplementation
 
 class Node:
-    ELEMENT_NODE: Literal[1]
-    ATTRIBUTE_NODE: Literal[2]
-    TEXT_NODE: Literal[3]
-    CDATA_SECTION_NODE: Literal[4]
-    ENTITY_REFERENCE_NODE: Literal[5]
-    ENTITY_NODE: Literal[6]
-    PROCESSING_INSTRUCTION_NODE: Literal[7]
-    COMMENT_NODE: Literal[8]
-    DOCUMENT_NODE: Literal[9]
-    DOCUMENT_TYPE_NODE: Literal[10]
-    DOCUMENT_FRAGMENT_NODE: Literal[11]
-    NOTATION_NODE: Literal[12]
+    __slots__ = ()
+    ELEMENT_NODE: Final = 1
+    ATTRIBUTE_NODE: Final = 2
+    TEXT_NODE: Final = 3
+    CDATA_SECTION_NODE: Final = 4
+    ENTITY_REFERENCE_NODE: Final = 5
+    ENTITY_NODE: Final = 6
+    PROCESSING_INSTRUCTION_NODE: Final = 7
+    COMMENT_NODE: Final = 8
+    DOCUMENT_NODE: Final = 9
+    DOCUMENT_TYPE_NODE: Final = 10
+    DOCUMENT_FRAGMENT_NODE: Final = 11
+    NOTATION_NODE: Final = 12
 
 # ExceptionCode
 INDEX_SIZE_ERR: Final = 1
@@ -88,10 +89,10 @@ class ValidationErr(DOMException):
     code: Literal[16]
 
 class UserDataHandler:
-    NODE_CLONED: Literal[1]
-    NODE_IMPORTED: Literal[2]
-    NODE_DELETED: Literal[3]
-    NODE_RENAMED: Literal[4]
+    NODE_CLONED: Final = 1
+    NODE_IMPORTED: Final = 2
+    NODE_DELETED: Final = 3
+    NODE_RENAMED: Final = 4
 
 XML_NAMESPACE: Final = "http://www.w3.org/XML/1998/namespace"
 XMLNS_NAMESPACE: Final = "http://www.w3.org/2000/xmlns/"
diff --git a/mypy/typeshed/stdlib/xml/dom/expatbuilder.pyi b/mypy/typeshed/stdlib/xml/dom/expatbuilder.pyi
index 228ad07e15ad..2b9ac8876970 100644
--- a/mypy/typeshed/stdlib/xml/dom/expatbuilder.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/expatbuilder.pyi
@@ -1,5 +1,5 @@
 from _typeshed import ReadableBuffer, SupportsRead
-from typing import Any, NoReturn
+from typing import Any, Final, NoReturn
 from typing_extensions import TypeAlias
 from xml.dom.minidom import Document, DocumentFragment, DOMImplementation, Element, Node, TypeInfo
 from xml.dom.xmlbuilder import DOMBuilderFilter, Options
@@ -7,16 +7,17 @@ from xml.parsers.expat import XMLParserType
 
 _Model: TypeAlias = tuple[int, int, str | None, tuple[Any, ...]]  # same as in pyexpat
 
-TEXT_NODE = Node.TEXT_NODE
-CDATA_SECTION_NODE = Node.CDATA_SECTION_NODE
-DOCUMENT_NODE = Node.DOCUMENT_NODE
-FILTER_ACCEPT = DOMBuilderFilter.FILTER_ACCEPT
-FILTER_REJECT = DOMBuilderFilter.FILTER_REJECT
-FILTER_SKIP = DOMBuilderFilter.FILTER_SKIP
-FILTER_INTERRUPT = DOMBuilderFilter.FILTER_INTERRUPT
+TEXT_NODE: Final = Node.TEXT_NODE
+CDATA_SECTION_NODE: Final = Node.CDATA_SECTION_NODE
+DOCUMENT_NODE: Final = Node.DOCUMENT_NODE
+FILTER_ACCEPT: Final = DOMBuilderFilter.FILTER_ACCEPT
+FILTER_REJECT: Final = DOMBuilderFilter.FILTER_REJECT
+FILTER_SKIP: Final = DOMBuilderFilter.FILTER_SKIP
+FILTER_INTERRUPT: Final = DOMBuilderFilter.FILTER_INTERRUPT
 theDOMImplementation: DOMImplementation
 
 class ElementInfo:
+    __slots__ = ("_attr_info", "_model", "tagName")
     tagName: str
     def __init__(self, tagName: str, model: _Model | None = None) -> None: ...
     def getAttributeType(self, aname: str) -> TypeInfo: ...
@@ -66,19 +67,23 @@ class ExpatBuilder:
     def xml_decl_handler(self, version: str, encoding: str | None, standalone: int) -> None: ...
 
 class FilterVisibilityController:
+    __slots__ = ("filter",)
     filter: DOMBuilderFilter
     def __init__(self, filter: DOMBuilderFilter) -> None: ...
     def startContainer(self, node: Node) -> int: ...
     def acceptNode(self, node: Node) -> int: ...
 
 class FilterCrutch:
+    __slots__ = ("_builder", "_level", "_old_start", "_old_end")
     def __init__(self, builder: ExpatBuilder) -> None: ...
 
 class Rejecter(FilterCrutch):
+    __slots__ = ()
     def start_element_handler(self, *args: Any) -> None: ...
     def end_element_handler(self, *args: Any) -> None: ...
 
 class Skipper(FilterCrutch):
+    __slots__ = ()
     def start_element_handler(self, *args: Any) -> None: ...
     def end_element_handler(self, *args: Any) -> None: ...
 
diff --git a/mypy/typeshed/stdlib/xml/dom/minicompat.pyi b/mypy/typeshed/stdlib/xml/dom/minicompat.pyi
index 162f60254a58..6fcaee019dc2 100644
--- a/mypy/typeshed/stdlib/xml/dom/minicompat.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/minicompat.pyi
@@ -8,11 +8,13 @@ _T = TypeVar("_T")
 StringTypes: tuple[type[str]]
 
 class NodeList(list[_T]):
+    __slots__ = ()
     @property
     def length(self) -> int: ...
     def item(self, index: int) -> _T | None: ...
 
 class EmptyNodeList(tuple[()]):
+    __slots__ = ()
     @property
     def length(self) -> Literal[0]: ...
     def item(self, index: int) -> None: ...
diff --git a/mypy/typeshed/stdlib/xml/dom/minidom.pyi b/mypy/typeshed/stdlib/xml/dom/minidom.pyi
index b9da9f3558ff..e0431417aa3c 100644
--- a/mypy/typeshed/stdlib/xml/dom/minidom.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/minidom.pyi
@@ -188,6 +188,7 @@ _AttrChildrenVar = TypeVar("_AttrChildrenVar", bound=_AttrChildren)
 _AttrChildrenPlusFragment = TypeVar("_AttrChildrenPlusFragment", bound=_AttrChildren | DocumentFragment)
 
 class Attr(Node):
+    __slots__ = ("_name", "_value", "namespaceURI", "_prefix", "childNodes", "_localName", "ownerDocument", "ownerElement")
     nodeType: ClassVar[Literal[2]]
     nodeName: str  # same as Attr.name
     nodeValue: str  # same as Attr.value
@@ -231,6 +232,7 @@ class Attr(Node):
 # In the DOM, this interface isn't specific to Attr, but our implementation is
 # because that's the only place we use it.
 class NamedNodeMap:
+    __slots__ = ("_attrs", "_attrsNS", "_ownerElement")
     def __init__(self, attrs: dict[str, Attr], attrsNS: dict[_NSName, Attr], ownerElement: Element) -> None: ...
     @property
     def length(self) -> int: ...
@@ -262,6 +264,7 @@ class NamedNodeMap:
 AttributeList = NamedNodeMap
 
 class TypeInfo:
+    __slots__ = ("namespace", "name")
     namespace: str | None
     name: str | None
     def __init__(self, namespace: Incomplete | None, name: str | None) -> None: ...
@@ -270,6 +273,20 @@ _ElementChildrenVar = TypeVar("_ElementChildrenVar", bound=_ElementChildren)
 _ElementChildrenPlusFragment = TypeVar("_ElementChildrenPlusFragment", bound=_ElementChildren | DocumentFragment)
 
 class Element(Node):
+    __slots__ = (
+        "ownerDocument",
+        "parentNode",
+        "tagName",
+        "nodeName",
+        "prefix",
+        "namespaceURI",
+        "_localName",
+        "childNodes",
+        "_attrs",
+        "_attrsNS",
+        "nextSibling",
+        "previousSibling",
+    )
     nodeType: ClassVar[Literal[1]]
     nodeName: str  # same as Element.tagName
     nodeValue: None
@@ -331,6 +348,7 @@ class Element(Node):
     def removeChild(self, oldChild: _ElementChildrenVar) -> _ElementChildrenVar: ...  # type: ignore[override]
 
 class Childless:
+    __slots__ = ()
     attributes: None
     childNodes: EmptyNodeList
     @property
@@ -347,6 +365,7 @@ class Childless:
     def replaceChild(self, newChild: _NodesThatAreChildren | DocumentFragment, oldChild: _NodesThatAreChildren) -> NoReturn: ...
 
 class ProcessingInstruction(Childless, Node):
+    __slots__ = ("target", "data")
     nodeType: ClassVar[Literal[7]]
     nodeName: str  # same as ProcessingInstruction.target
     nodeValue: str  # same as ProcessingInstruction.data
@@ -373,6 +392,7 @@ class ProcessingInstruction(Childless, Node):
     def writexml(self, writer: SupportsWrite[str], indent: str = "", addindent: str = "", newl: str = "") -> None: ...
 
 class CharacterData(Childless, Node):
+    __slots__ = ("_data", "ownerDocument", "parentNode", "previousSibling", "nextSibling")
     nodeValue: str
     attributes: None
 
@@ -397,6 +417,7 @@ class CharacterData(Childless, Node):
     def replaceData(self, offset: int, count: int, arg: str) -> None: ...
 
 class Text(CharacterData):
+    __slots__ = ()
     nodeType: ClassVar[Literal[3]]
     nodeName: Literal["#text"]
     nodeValue: str  # same as CharacterData.data, the content of the text node
@@ -448,6 +469,7 @@ class Comment(CharacterData):
     def writexml(self, writer: SupportsWrite[str], indent: str = "", addindent: str = "", newl: str = "") -> None: ...
 
 class CDATASection(Text):
+    __slots__ = ()
     nodeType: ClassVar[Literal[4]]  # type: ignore[assignment]
     nodeName: Literal["#cdata-section"]  # type: ignore[assignment]
     nodeValue: str  # same as CharacterData.data, the content of the CDATA Section
@@ -460,6 +482,7 @@ class CDATASection(Text):
     def writexml(self, writer: SupportsWrite[str], indent: str = "", addindent: str = "", newl: str = "") -> None: ...
 
 class ReadOnlySequentialNamedNodeMap(Generic[_N]):
+    __slots__ = ("_seq",)
     def __init__(self, seq: Sequence[_N] = ()) -> None: ...
     def __len__(self) -> int: ...
     def getNamedItem(self, name: str) -> _N | None: ...
@@ -474,6 +497,7 @@ class ReadOnlySequentialNamedNodeMap(Generic[_N]):
     def length(self) -> int: ...
 
 class Identified:
+    __slots__ = ("publicId", "systemId")
     publicId: str | None
     systemId: str | None
 
@@ -565,6 +589,7 @@ class DOMImplementation(DOMImplementationLS):
     def getInterface(self, feature: str) -> Self | None: ...
 
 class ElementInfo:
+    __slots__ = ("tagName",)
     tagName: str
     def __init__(self, name: str) -> None: ...
     def getAttributeType(self, aname: str) -> TypeInfo: ...
@@ -577,6 +602,7 @@ class ElementInfo:
 _DocumentChildrenPlusFragment = TypeVar("_DocumentChildrenPlusFragment", bound=_DocumentChildren | DocumentFragment)
 
 class Document(Node, DocumentLS):
+    __slots__ = ("_elem_info", "doctype", "_id_search_stack", "childNodes", "_id_cache")
     nodeType: ClassVar[Literal[9]]
     nodeName: Literal["#document"]
     nodeValue: None
diff --git a/mypy/typeshed/stdlib/xml/dom/pulldom.pyi b/mypy/typeshed/stdlib/xml/dom/pulldom.pyi
index d9458654c185..df7a3ad0eddb 100644
--- a/mypy/typeshed/stdlib/xml/dom/pulldom.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/pulldom.pyi
@@ -99,7 +99,7 @@ class SAX2DOM(PullDOM):
     def ignorableWhitespace(self, chars: str) -> None: ...
     def characters(self, chars: str) -> None: ...
 
-default_bufsize: int
+default_bufsize: Final[int]
 
 def parse(
     stream_or_string: str | _SupportsReadClose[bytes] | _SupportsReadClose[str],
diff --git a/mypy/typeshed/stdlib/xml/dom/xmlbuilder.pyi b/mypy/typeshed/stdlib/xml/dom/xmlbuilder.pyi
index 6fb18bbc4eda..f19f7050b08d 100644
--- a/mypy/typeshed/stdlib/xml/dom/xmlbuilder.pyi
+++ b/mypy/typeshed/stdlib/xml/dom/xmlbuilder.pyi
@@ -1,5 +1,5 @@
 from _typeshed import SupportsRead
-from typing import Any, Literal, NoReturn
+from typing import Any, Final, Literal, NoReturn
 from xml.dom.minidom import Document, Node, _DOMErrorHandler
 
 __all__ = ["DOMBuilder", "DOMEntityResolver", "DOMInputSource"]
@@ -29,10 +29,10 @@ class DOMBuilder:
     entityResolver: DOMEntityResolver | None
     errorHandler: _DOMErrorHandler | None
     filter: DOMBuilderFilter | None
-    ACTION_REPLACE: Literal[1]
-    ACTION_APPEND_AS_CHILDREN: Literal[2]
-    ACTION_INSERT_AFTER: Literal[3]
-    ACTION_INSERT_BEFORE: Literal[4]
+    ACTION_REPLACE: Final = 1
+    ACTION_APPEND_AS_CHILDREN: Final = 2
+    ACTION_INSERT_AFTER: Final = 3
+    ACTION_INSERT_BEFORE: Final = 4
     def __init__(self) -> None: ...
     def setFeature(self, name: str, state: int) -> None: ...
     def supportsFeature(self, name: str) -> bool: ...
@@ -44,9 +44,11 @@ class DOMBuilder:
     def parseWithContext(self, input: DOMInputSource, cnode: Node, action: Literal[1, 2, 3, 4]) -> NoReturn: ...
 
 class DOMEntityResolver:
+    __slots__ = ("_opener",)
     def resolveEntity(self, publicId: str | None, systemId: str) -> DOMInputSource: ...
 
 class DOMInputSource:
+    __slots__ = ("byteStream", "characterStream", "stringData", "encoding", "publicId", "systemId", "baseURI")
     byteStream: SupportsRead[bytes] | None
     characterStream: SupportsRead[str] | None
     stringData: str | None
@@ -56,10 +58,10 @@ class DOMInputSource:
     baseURI: str | None
 
 class DOMBuilderFilter:
-    FILTER_ACCEPT: Literal[1]
-    FILTER_REJECT: Literal[2]
-    FILTER_SKIP: Literal[3]
-    FILTER_INTERRUPT: Literal[4]
+    FILTER_ACCEPT: Final = 1
+    FILTER_REJECT: Final = 2
+    FILTER_SKIP: Final = 3
+    FILTER_INTERRUPT: Final = 4
     whatToShow: int
     def acceptNode(self, element: Node) -> Literal[1, 2, 3, 4]: ...
     def startContainer(self, element: Node) -> Literal[1, 2, 3, 4]: ...
@@ -72,8 +74,8 @@ class DocumentLS:
     def saveXML(self, snode: Node | None) -> str: ...
 
 class DOMImplementationLS:
-    MODE_SYNCHRONOUS: Literal[1]
-    MODE_ASYNCHRONOUS: Literal[2]
+    MODE_SYNCHRONOUS: Final = 1
+    MODE_ASYNCHRONOUS: Final = 2
     def createDOMBuilder(self, mode: Literal[1], schemaType: None) -> DOMBuilder: ...
     def createDOMWriter(self) -> NoReturn: ...
     def createDOMInputSource(self) -> DOMInputSource: ...
diff --git a/mypy/typeshed/stdlib/xml/etree/ElementInclude.pyi b/mypy/typeshed/stdlib/xml/etree/ElementInclude.pyi
index fd829fdaa5ff..10784e7d4021 100644
--- a/mypy/typeshed/stdlib/xml/etree/ElementInclude.pyi
+++ b/mypy/typeshed/stdlib/xml/etree/ElementInclude.pyi
@@ -9,9 +9,10 @@ class _Loader(Protocol):
     @overload
     def __call__(self, href: FileDescriptorOrPath, parse: Literal["text"], encoding: str | None = None) -> str: ...
 
-XINCLUDE: Final[str]
-XINCLUDE_INCLUDE: Final[str]
-XINCLUDE_FALLBACK: Final[str]
+XINCLUDE: Final = "{http://www.w3.org/2001/XInclude}"
+
+XINCLUDE_INCLUDE: Final = "{http://www.w3.org/2001/XInclude}include"
+XINCLUDE_FALLBACK: Final = "{http://www.w3.org/2001/XInclude}fallback"
 
 DEFAULT_MAX_INCLUSION_DEPTH: Final = 6
 
diff --git a/mypy/typeshed/stdlib/xml/etree/ElementPath.pyi b/mypy/typeshed/stdlib/xml/etree/ElementPath.pyi
index ebfb4f1ffbb9..80f3c55c1489 100644
--- a/mypy/typeshed/stdlib/xml/etree/ElementPath.pyi
+++ b/mypy/typeshed/stdlib/xml/etree/ElementPath.pyi
@@ -1,10 +1,10 @@
 from collections.abc import Callable, Generator, Iterable
 from re import Pattern
-from typing import Any, Literal, TypeVar, overload
+from typing import Any, Final, Literal, TypeVar, overload
 from typing_extensions import TypeAlias
 from xml.etree.ElementTree import Element
 
-xpath_tokenizer_re: Pattern[str]
+xpath_tokenizer_re: Final[Pattern[str]]
 
 _Token: TypeAlias = tuple[str, str]
 _Next: TypeAlias = Callable[[], _Token]
@@ -20,7 +20,7 @@ def prepare_descendant(next: _Next, token: _Token) -> _Callback | None: ...
 def prepare_parent(next: _Next, token: _Token) -> _Callback: ...
 def prepare_predicate(next: _Next, token: _Token) -> _Callback | None: ...
 
-ops: dict[str, Callable[[_Next, _Token], _Callback | None]]
+ops: Final[dict[str, Callable[[_Next, _Token], _Callback | None]]]
 
 class _SelectorContext:
     parent_map: dict[Element, Element] | None
diff --git a/mypy/typeshed/stdlib/xml/etree/ElementTree.pyi b/mypy/typeshed/stdlib/xml/etree/ElementTree.pyi
index 1d7e1725dd8e..e8f737778040 100644
--- a/mypy/typeshed/stdlib/xml/etree/ElementTree.pyi
+++ b/mypy/typeshed/stdlib/xml/etree/ElementTree.pyi
@@ -3,7 +3,7 @@ from _collections_abc import dict_keys
 from _typeshed import FileDescriptorOrPath, ReadableBuffer, SupportsRead, SupportsWrite
 from collections.abc import Callable, Generator, ItemsView, Iterable, Iterator, Mapping, Sequence
 from typing import Any, Final, Generic, Literal, Protocol, SupportsIndex, TypeVar, overload, type_check_only
-from typing_extensions import TypeAlias, TypeGuard, deprecated
+from typing_extensions import TypeAlias, TypeGuard, deprecated, disjoint_base
 from xml.parsers.expat import XMLParserType
 
 __all__ = [
@@ -78,14 +78,13 @@ def canonicalize(
 ) -> None: ...
 
 # The tag for Element can be set to the Comment or ProcessingInstruction
-# functions defined in this module. _ElementCallable could be a recursive
-# type, but defining it that way uncovered a bug in pytype.
-_ElementCallable: TypeAlias = Callable[..., Element[Any]]
-_CallableElement: TypeAlias = Element[_ElementCallable]
+# functions defined in this module.
+_ElementCallable: TypeAlias = Callable[..., Element[_ElementCallable]]
 
 _Tag = TypeVar("_Tag", default=str, bound=str | _ElementCallable)
 _OtherTag = TypeVar("_OtherTag", default=str, bound=str | _ElementCallable)
 
+@disjoint_base
 class Element(Generic[_Tag]):
     tag: _Tag
     attrib: dict[str, str]
@@ -138,8 +137,8 @@ class Element(Generic[_Tag]):
     def __bool__(self) -> bool: ...
 
 def SubElement(parent: Element, tag: str, attrib: dict[str, str] = ..., **extra: str) -> Element: ...
-def Comment(text: str | None = None) -> _CallableElement: ...
-def ProcessingInstruction(target: str, text: str | None = None) -> _CallableElement: ...
+def Comment(text: str | None = None) -> Element[_ElementCallable]: ...
+def ProcessingInstruction(target: str, text: str | None = None) -> Element[_ElementCallable]: ...
 
 PI = ProcessingInstruction
 
@@ -182,7 +181,7 @@ class ElementTree(Generic[_Root]):
     ) -> None: ...
     def write_c14n(self, file: _FileWriteC14N) -> None: ...
 
-HTML_EMPTY: set[str]
+HTML_EMPTY: Final[set[str]]
 
 def register_namespace(prefix: str, uri: str) -> None: ...
 @overload
@@ -288,6 +287,7 @@ def fromstringlist(sequence: Sequence[str | ReadableBuffer], parser: XMLParser |
 # elementfactories.
 _ElementFactory: TypeAlias = Callable[[Any, dict[Any, Any]], Element]
 
+@disjoint_base
 class TreeBuilder:
     # comment_factory can take None because passing None to Comment is not an error
     def __init__(
@@ -353,6 +353,7 @@ _E = TypeVar("_E", default=Element)
 # The default target is TreeBuilder, which returns Element.
 # C14NWriterTarget does not implement a close method, so using it results
 # in a type of XMLParser[None].
+@disjoint_base
 class XMLParser(Generic[_E]):
     parser: XMLParserType
     target: _Target
diff --git a/mypy/typeshed/stdlib/xml/sax/__init__.pyi b/mypy/typeshed/stdlib/xml/sax/__init__.pyi
index 5a82b48c1e19..679466fa34d2 100644
--- a/mypy/typeshed/stdlib/xml/sax/__init__.pyi
+++ b/mypy/typeshed/stdlib/xml/sax/__init__.pyi
@@ -1,7 +1,7 @@
 import sys
 from _typeshed import ReadableBuffer, StrPath, SupportsRead, _T_co
 from collections.abc import Iterable
-from typing import Protocol, type_check_only
+from typing import Final, Protocol, type_check_only
 from typing_extensions import TypeAlias
 from xml.sax._exceptions import (
     SAXException as SAXException,
@@ -19,7 +19,7 @@ class _SupportsReadClose(SupportsRead[_T_co], Protocol[_T_co]):
 
 _Source: TypeAlias = StrPath | _SupportsReadClose[bytes] | _SupportsReadClose[str]
 
-default_parser_list: list[str]
+default_parser_list: Final[list[str]]
 
 def make_parser(parser_list: Iterable[str] = ()) -> XMLReader: ...
 def parse(source: _Source, handler: ContentHandler, errorHandler: ErrorHandler = ...) -> None: ...
diff --git a/mypy/typeshed/stdlib/xml/sax/expatreader.pyi b/mypy/typeshed/stdlib/xml/sax/expatreader.pyi
index 012d6c03e121..3f9573a25f9a 100644
--- a/mypy/typeshed/stdlib/xml/sax/expatreader.pyi
+++ b/mypy/typeshed/stdlib/xml/sax/expatreader.pyi
@@ -1,7 +1,7 @@
 import sys
 from _typeshed import ReadableBuffer
 from collections.abc import Mapping
-from typing import Any, Literal, overload
+from typing import Any, Final, Literal, overload
 from typing_extensions import TypeAlias
 from xml.sax import _Source, xmlreader
 from xml.sax.handler import _ContentHandlerProtocol
@@ -11,7 +11,7 @@ if sys.version_info >= (3, 10):
 
 _BoolType: TypeAlias = Literal[0, 1] | bool
 
-version: str
+version: Final[str]
 AttributesImpl = xmlreader.AttributesImpl
 AttributesNSImpl = xmlreader.AttributesNSImpl
 
diff --git a/mypy/typeshed/stdlib/xml/sax/handler.pyi b/mypy/typeshed/stdlib/xml/sax/handler.pyi
index 550911734596..5ecbfa6f1272 100644
--- a/mypy/typeshed/stdlib/xml/sax/handler.pyi
+++ b/mypy/typeshed/stdlib/xml/sax/handler.pyi
@@ -1,8 +1,8 @@
 import sys
-from typing import Literal, NoReturn, Protocol, type_check_only
+from typing import Final, NoReturn, Protocol, type_check_only
 from xml.sax import xmlreader
 
-version: str
+version: Final[str]
 
 @type_check_only
 class _ErrorHandlerProtocol(Protocol):  # noqa: Y046  # Protocol is not used
@@ -62,20 +62,20 @@ class _EntityResolverProtocol(Protocol):  # noqa: Y046  # Protocol is not used
 class EntityResolver:
     def resolveEntity(self, publicId: str | None, systemId: str) -> str: ...
 
-feature_namespaces: str
-feature_namespace_prefixes: str
-feature_string_interning: str
-feature_validation: str
-feature_external_ges: str
-feature_external_pes: str
-all_features: list[str]
-property_lexical_handler: Literal["http://xml.org/sax/properties/lexical-handler"]
-property_declaration_handler: Literal["http://xml.org/sax/properties/declaration-handler"]
-property_dom_node: Literal["http://xml.org/sax/properties/dom-node"]
-property_xml_string: Literal["http://xml.org/sax/properties/xml-string"]
-property_encoding: Literal["http://www.python.org/sax/properties/encoding"]
-property_interning_dict: Literal["http://www.python.org/sax/properties/interning-dict"]
-all_properties: list[str]
+feature_namespaces: Final = "http://xml.org/sax/features/namespaces"
+feature_namespace_prefixes: Final = "http://xml.org/sax/features/namespace-prefixes"
+feature_string_interning: Final = "http://xml.org/sax/features/string-interning"
+feature_validation: Final = "http://xml.org/sax/features/validation"
+feature_external_ges: Final[str]  # too long string
+feature_external_pes: Final[str]  # too long string
+all_features: Final[list[str]]
+property_lexical_handler: Final = "http://xml.org/sax/properties/lexical-handler"
+property_declaration_handler: Final = "http://xml.org/sax/properties/declaration-handler"
+property_dom_node: Final = "http://xml.org/sax/properties/dom-node"
+property_xml_string: Final = "http://xml.org/sax/properties/xml-string"
+property_encoding: Final = "http://www.python.org/sax/properties/encoding"
+property_interning_dict: Final[str]  # too long string
+all_properties: Final[list[str]]
 
 if sys.version_info >= (3, 10):
     class LexicalHandler:
diff --git a/mypy/typeshed/stdlib/zipfile/__init__.pyi b/mypy/typeshed/stdlib/zipfile/__init__.pyi
index 73e3a92fd0e2..e573d04dba05 100644
--- a/mypy/typeshed/stdlib/zipfile/__init__.pyi
+++ b/mypy/typeshed/stdlib/zipfile/__init__.pyi
@@ -161,7 +161,7 @@ class ZipFile:
         def __init__(
             self,
             file: StrPath | _ZipWritable,
-            mode: Literal["w", "x"] = ...,
+            mode: Literal["w", "x"],
             compression: int = 0,
             allowZip64: bool = True,
             compresslevel: int | None = None,
@@ -173,7 +173,7 @@ class ZipFile:
         def __init__(
             self,
             file: StrPath | _ZipReadableTellable,
-            mode: Literal["a"] = ...,
+            mode: Literal["a"],
             compression: int = 0,
             allowZip64: bool = True,
             compresslevel: int | None = None,
@@ -208,7 +208,7 @@ class ZipFile:
         def __init__(
             self,
             file: StrPath | _ZipWritable,
-            mode: Literal["w", "x"] = ...,
+            mode: Literal["w", "x"],
             compression: int = 0,
             allowZip64: bool = True,
             compresslevel: int | None = None,
@@ -219,7 +219,7 @@ class ZipFile:
         def __init__(
             self,
             file: StrPath | _ZipReadableTellable,
-            mode: Literal["a"] = ...,
+            mode: Literal["a"],
             compression: int = 0,
             allowZip64: bool = True,
             compresslevel: int | None = None,
@@ -272,6 +272,29 @@ class PyZipFile(ZipFile):
     def writepy(self, pathname: str, basename: str = "", filterfunc: Callable[[str], bool] | None = None) -> None: ...
 
 class ZipInfo:
+    __slots__ = (
+        "orig_filename",
+        "filename",
+        "date_time",
+        "compress_type",
+        "compress_level",
+        "comment",
+        "extra",
+        "create_system",
+        "create_version",
+        "extract_version",
+        "reserved",
+        "flag_bits",
+        "volume",
+        "internal_attr",
+        "external_attr",
+        "header_offset",
+        "CRC",
+        "compress_size",
+        "file_size",
+        "_raw_time",
+        "_end_offset",
+    )
     filename: str
     date_time: _DateTuple
     compress_type: int
diff --git a/mypy/typeshed/stdlib/zipfile/_path/glob.pyi b/mypy/typeshed/stdlib/zipfile/_path/glob.pyi
index f25ae71725c0..f6a661be8cdf 100644
--- a/mypy/typeshed/stdlib/zipfile/_path/glob.pyi
+++ b/mypy/typeshed/stdlib/zipfile/_path/glob.pyi
@@ -4,7 +4,11 @@ from re import Match
 
 if sys.version_info >= (3, 13):
     class Translator:
-        def __init__(self, seps: str = ...) -> None: ...
+        if sys.platform == "win32":
+            def __init__(self, seps: str = "\\/") -> None: ...
+        else:
+            def __init__(self, seps: str = "/") -> None: ...
+
         def translate(self, pattern: str) -> str: ...
         def extend(self, pattern: str) -> str: ...
         def match_dirs(self, pattern: str) -> str: ...
diff --git a/mypy/typeshed/stdlib/zoneinfo/__init__.pyi b/mypy/typeshed/stdlib/zoneinfo/__init__.pyi
index e9f54fbf2a26..b7433f835f83 100644
--- a/mypy/typeshed/stdlib/zoneinfo/__init__.pyi
+++ b/mypy/typeshed/stdlib/zoneinfo/__init__.pyi
@@ -1,7 +1,7 @@
 import sys
 from collections.abc import Iterable
 from datetime import datetime, timedelta, tzinfo
-from typing_extensions import Self
+from typing_extensions import Self, disjoint_base
 from zoneinfo._common import ZoneInfoNotFoundError as ZoneInfoNotFoundError, _IOBytes
 from zoneinfo._tzpath import (
     TZPATH as TZPATH,
@@ -12,6 +12,7 @@ from zoneinfo._tzpath import (
 
 __all__ = ["ZoneInfo", "reset_tzpath", "available_timezones", "TZPATH", "ZoneInfoNotFoundError", "InvalidTZPathWarning"]
 
+@disjoint_base
 class ZoneInfo(tzinfo):
     @property
     def key(self) -> str: ...
diff --git a/test-data/unit/pythoneval.test b/test-data/unit/pythoneval.test
index 9b5d8a1ac54c..f0a9f2afd53a 100644
--- a/test-data/unit/pythoneval.test
+++ b/test-data/unit/pythoneval.test
@@ -1479,9 +1479,9 @@ y: str
 if isinstance(x, int):
     reveal_type(x)
 [out]
-_testIsInstanceAdHocIntersectionWithStrAndBytes.py:3: error: Subclass of "str" and "bytes" cannot exist: would have incompatible method signatures
+_testIsInstanceAdHocIntersectionWithStrAndBytes.py:3: error: Subclass of "str" and "bytes" cannot exist: have distinct disjoint bases
 _testIsInstanceAdHocIntersectionWithStrAndBytes.py:4: error: Statement is unreachable
-_testIsInstanceAdHocIntersectionWithStrAndBytes.py:6: error: Subclass of "str" and "int" cannot exist: would have incompatible method signatures
+_testIsInstanceAdHocIntersectionWithStrAndBytes.py:6: error: Subclass of "str" and "int" cannot exist: have distinct disjoint bases
 _testIsInstanceAdHocIntersectionWithStrAndBytes.py:7: error: Statement is unreachable
 
 [case testAsyncioFutureWait]