fix tee.__iter__ annotation (closes #151)

Author: maxfischer2781

asyncstdlib/itertools.py

@@ -454,7 +454,7 @@ def __getitem__(
     ) -> Union[AsyncIterator[T], Tuple[AsyncIterator[T], ...]]:
         return self._children[item]
 
-    def __iter__(self) -> Iterator[AnyIterable[T]]:
+    def __iter__(self) -> Iterator[AsyncIterator[T]]:
         yield from self._children
 
     async def __aenter__(self) -> "Tee[T]":

asyncstdlib/itertools.pyi

@@ -130,7 +130,7 @@ class tee(Generic[T]):
     def __getitem__(self, item: int) -> AsyncIterator[T]: ...
     @overload
     def __getitem__(self, item: slice) -> tuple[AsyncIterator[T], ...]: ...
-    def __iter__(self) -> Iterator[AnyIterable[T]]: ...
+    def __iter__(self) -> Iterator[AsyncIterator[T]]: ...
     async def __aenter__(self: Self) -> Self: ...
     async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None: ...
     async def aclose(self) -> None: ...