zip.__iter__ and reversed.__iter__ return self (#7123)

Author: JelleZijlstra

stdlib/builtins.pyi

@@ -1412,7 +1412,7 @@ class reversed(Iterator[_T], Generic[_T]):
     def __init__(self, __sequence: Reversible[_T]) -> None: ...
     @overload
     def __init__(self, __sequence: SupportsLenAndGetItem[_T]) -> None: ...
-    def __iter__(self) -> Iterator[_T]: ...
+    def __iter__(self: Self) -> Self: ...
     def __next__(self) -> _T: ...
 
 def repr(__obj: object) -> str: ...
@@ -1524,7 +1524,7 @@ class zip(Iterator[_T_co], Generic[_T_co]):
             *iterables: Iterable[Any],
         ) -> zip[tuple[Any, ...]]: ...
 
-    def __iter__(self) -> Iterator[_T_co]: ...
+    def __iter__(self: Self) -> Self: ...
     def __next__(self) -> _T_co: ...
 
 # Signature of `builtins.__import__` should be kept identical to `importlib.__import__`