changed callable to return TypeIs[Callable] and added regression test for gradual typing

Author: randolf-scholz

stdlib/@tests/test_cases/builtins/check_callable.py

@@ -0,0 +1,6 @@
+from typing import Any
+
+
+def test_gradual_assignment(arg: Any) -> None:
+    if callable(arg):
+        _: int = arg()  # pyright: ignore[reportUnknownVariableType]

stdlib/builtins.pyi

@@ -1568,7 +1568,7 @@ else:
     def bin(number: SupportsIndex, /) -> str: ...
 
 def breakpoint(*args: Any, **kws: Any) -> None: ...
-def callable(obj: object, /) -> TypeIs[Callable[..., object]]: ...
+def callable(obj: object, /) -> TypeIs[Callable]: ...
 def chr(i: SupportsIndex, /) -> str: ...
 def aiter(async_iterable: SupportsAiter[_SupportsAnextT_co], /) -> _SupportsAnextT_co: ...