Merge remote-tracking branch 'origin/TypeAliasType-extension' into TypeAliasType-extension

Author: Daraan

CHANGELOG.md

@@ -12,6 +12,10 @@
 - Fix bug where a subscripted `TypeAliasType` instance did not have all
   attributes of the original `TypeAliasType` instance on older Python versions.
   Patch by [Daraan](https://github.com/Daraan) and Alex Waygood.
+- Fix bug where subscripted `TypeAliasType` instances (and some other
+  subscripted objects) had wrong parameters if they were directly
+  subscripted with an `Unpack` object.
+  Patch by [Daraan](https://github.com/Daraan).
 
 # Release 4.12.2 (June 7, 2024)
 

src/test_typing_extensions.py

@@ -7492,7 +7492,6 @@ class Foo(Generic[Unpack[Ts]]):
         call_int_T = CallableP[Unpack[Tuple[int, T]]]
         self.assertEqual(call_int_T.__parameters__, (T,))
 
-
     def test_alias_attributes(self):
         T = TypeVar('T')
         T2 = TypeVar('T2')