Fix some mypy errors

hikari/impl/event_manager_base.py

@@ -68,7 +68,7 @@
 
 
 def _generate_weak_listener(
-    reference: weakref.WeakMethod,
+    reference: weakref.WeakMethod[typing.Any],
 ) -> typing.Callable[[event_manager_.EventT], typing.Coroutine[typing.Any, typing.Any, None]]:
     async def call_weak_method(event: event_manager_.EventT) -> None:
         method = reference()
@@ -233,7 +233,7 @@ def open(self) -> None:
             # listener with a weakref then try to close this on deletion. While this may lead to their consoles being
             # spammed, this is a small price to pay as it'll be way more obvious what's wrong than if we just left them
             # with a vague ominous memory leak.
-            reference = weakref.WeakMethod(self._listener)  # type: ignore[arg-type]
+            reference = weakref.WeakMethod(self._listener)
             listener = _generate_weak_listener(reference)
             self._registered_listener = listener
             self._event_manager.subscribe(self._event_type, listener)

hikari/internal/enums.pyi

@@ -63,12 +63,19 @@ class Flag(__enum.IntFlag):
     def __len__(self) -> int: ...
     @staticmethod
     def __new__(cls: __Type[__FlagT], value: int = 0) -> __FlagT: ...
-    isdisjoint = is_disjoint
-    issuperset = is_superset
-    symmetricdifference = symmetric_difference
-    __contains__ = issubset = is_subset
-    __rand__ = __and__ = intersection
-    __ror__ = __or__ = union
-    __rsub__ = __sub__ = difference
-    __rxor__ = __xor__ = symmetric_difference
-    __invert__ = invert
+
+    # Aliases
+    def isdisjoint(self: __FlagT, other: __Union[int, __FlagT]) -> bool: ... # is_disjoint
+    def issuperset(self: __FlagT, other: __Union[int, __FlagT]) -> bool: ... # is_superset
+    def symmetricdifference(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # symmetric_difference
+    def issubset(self: __FlagT, other: __Union[int, __FlagT]) -> bool: ...  # is_subset
+    def __contains__(self: __FlagT, other: __Union[int, __FlagT]) -> bool: ...  # is_subset
+    def __rand__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # intersection
+    def __and__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # intersection
+    def __ror__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # union
+    def __or__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # union
+    def __rsub__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # difference
+    def __sub__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # difference
+    def __rxor__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # symmetric_difference
+    def __xor__(self: __FlagT, other: __Union[int, __FlagT]) -> __FlagT: ... # symmetric_difference
+    def __invert__(self: __FlagT) -> __FlagT: ... # invert