test union return types

Author: not-my-profile

stdlib/builtins.pyi

@@ -26,7 +26,6 @@ from collections.abc import Callable
 from io import BufferedRandom, BufferedReader, BufferedWriter, FileIO, TextIOWrapper
 from types import CodeType, TracebackType, _Cell
 from typing import (
-    IO,
     AbstractSet,
     Any,
     BinaryIO,
@@ -49,6 +48,7 @@ from typing import (
     SupportsFloat,
     SupportsInt,
     SupportsRound,
+    TextIO,
     TypeVar,
     Union,
     overload,
@@ -1327,7 +1327,7 @@ def open(
     newline: str | None = ...,
     closefd: bool = ...,
     opener: _Opener | None = ...,
-) -> IO[Any]: ...
+) -> BinaryIO | TextIO: ...
 def ord(__c: str | bytes) -> int: ...
 
 class _SupportsWriteAndFlush(SupportsWrite[_T_contra], Protocol[_T_contra]):

stdlib/subprocess.pyi

@@ -633,7 +633,7 @@ if sys.version_info >= (3, 7):
         encoding: str | None = ...,
         errors: str | None = ...,
         text: bool | None = ...,
-    ) -> Any: ...  # morally: -> _TXT
+    ) -> _TXT: ...  # morally: -> _TXT
 
 else:
     @overload
@@ -755,7 +755,7 @@ else:
         input: _TXT | None = ...,
         encoding: str | None = ...,
         errors: str | None = ...,
-    ) -> Any: ...  # morally: -> _TXT
+    ) -> _TXT: ...  # morally: -> _TXT
 
 PIPE: int
 STDOUT: int