MAINT: Annotate missing attributes of np.number subclasses

* `integer.numerator` & `denominator`
* `integer.__round__` & `floating.__round__`
* `floating.as_integer_ratio`
* `float64.__getnewargs__` / `complex128.__getnewargs__`
* `float64.is_integer`, `hex`, `fromhex`, `__trunc__` & `__getformat__`
* `float64.__ceil__` & `float64.__floor__` (python >= 3.9 only)

Author: Bas van Beek

numpy/__init__.pyi

@@ -3159,6 +3159,15 @@ else:
     ]
 
 class integer(number[_NBit1]):  # type: ignore
+    @property
+    def numerator(self: _ScalarType) -> _ScalarType: ...
+    @property
+    def denominator(self) -> L[1]: ...
+    @overload
+    def __round__(self, ndigits: None = ...) -> int: ...
+    @overload
+    def __round__(self: _ScalarType, ndigits: SupportsIndex) -> _ScalarType: ...
+
     # NOTE: `__index__` is technically defined in the bottom-most
     # sub-classes (`int64`, `uint32`, etc)
     def item(
@@ -3232,6 +3241,10 @@ class timedelta64(generic):
         __value: Union[None, int, _CharLike_co, dt.timedelta, timedelta64] = ...,
         __format: Union[_CharLike_co, Tuple[_CharLike_co, _IntLike_co]] = ...,
     ) -> None: ...
+    @property
+    def numerator(self: _ScalarType) -> _ScalarType: ...
+    @property
+    def denominator(self) -> L[1]: ...
 
     # NOTE: Only a limited number of units support conversion
     # to builtin scalar types: `Y`, `M`, `ns`, `ps`, `fs`, `as`
@@ -3301,7 +3314,8 @@ uint0 = unsignedinteger[_NBitIntP]
 uint = unsignedinteger[_NBitInt]
 ulonglong = unsignedinteger[_NBitLongLong]
 
-class inexact(number[_NBit1]): ...  # type: ignore
+class inexact(number[_NBit1]):  # type: ignore
+    def __getnewargs__(self: inexact[_64Bit]) -> Tuple[float, ...]: ...
 
 _IntType = TypeVar("_IntType", bound=integer)
 _FloatType = TypeVar('_FloatType', bound=floating)
@@ -3313,6 +3327,21 @@ class floating(inexact[_NBit1]):
         __args: Union[L[0], Tuple[()], Tuple[L[0]]] = ...,
     ) -> float: ...
     def tolist(self) -> float: ...
+    def is_integer(self: float64) -> bool: ...
+    def hex(self: float64) -> str: ...
+    @classmethod
+    def fromhex(cls: Type[float64], __string: str) -> float64: ...
+    def as_integer_ratio(self) -> Tuple[int, int]: ...
+    if sys.version_info >= (3, 9):
+        def __ceil__(self: float64) -> int: ...
+        def __floor__(self: float64) -> int: ...
+    def __trunc__(self: float64) -> int: ...
+    def __getnewargs__(self: float64) -> Tuple[float]: ...
+    def __getformat__(self: float64, __typestr: L["double", "float"]) -> str: ...
+    @overload
+    def __round__(self, ndigits: None = ...) -> int: ...
+    @overload
+    def __round__(self: _ScalarType, ndigits: SupportsIndex) -> _ScalarType: ...
     __add__: _FloatOp[_NBit1]
     __radd__: _FloatOp[_NBit1]
     __sub__: _FloatOp[_NBit1]
@@ -3357,6 +3386,9 @@ class complexfloating(inexact[_NBit1], Generic[_NBit1, _NBit2]):
     @property
     def imag(self) -> floating[_NBit2]: ...  # type: ignore[override]
     def __abs__(self) -> floating[_NBit1]: ...  # type: ignore[override]
+    def __getnewargs__(self: complex128) -> Tuple[float, float]: ...
+    # NOTE: Deprecated
+    # def __round__(self, ndigits=...): ...
     __add__: _ComplexOp[_NBit1]
     __radd__: _ComplexOp[_NBit1]
     __sub__: _ComplexOp[_NBit1]