Is this correct?

Author: bswck

stdlib/contextlib.pyi

@@ -87,8 +87,9 @@ class _GeneratorContextManagerBase(Generic[_G_co]):
 
 class _GeneratorContextManager(
     _GeneratorContextManagerBase[Generator[_T_co, _SendT_contra, _ReturnT_co]],
-    AbstractContextManager[_T_co, _ExitT_co],
+    AbstractContextManager[_T_co, bool | None],
     ContextDecorator[_ExcReturnT],  # _ExcReturnT is inferred by the type checker
+    Generic[_T_co, _SendT_contra, _ReturnT_co, _ExcReturnT, _ExitT_co],
 ):
     def __exit__(
         self, typ: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None
@@ -104,8 +105,9 @@ if sys.version_info >= (3, 10):
 
     class _AsyncGeneratorContextManager(
         _GeneratorContextManagerBase[AsyncGenerator[_T_co, _SendT_contra]],
-        AbstractAsyncContextManager[_T_co, _ExitT_co],
+        AbstractAsyncContextManager[_T_co, bool | None],
         AsyncContextDecorator[_ExcReturnT],  # _ExcReturnT is inferred by the type checker
+        Generic[_T_co, _SendT_contra, _ReturnT_co, _ExcReturnT, _ExitT_co],
     ):
         async def __aexit__(
             self, typ: type[BaseException] | None, value: BaseException | None, traceback: TracebackType | None