Revert "Byestring removal for 3.14 (#12490)"

stdlib/@tests/stubtest_allowlists/common.txt

@@ -181,6 +181,12 @@ _collections_abc.AsyncGenerator.__anext__
 _collections_abc.AsyncGenerator.aclose
 _collections_abc.AsyncIterator.__anext__
 
+# Pretend typing.ByteString is a Union, to better match its documented semantics.
+# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
+# because it's not an ABC that makes any sense and was deprecated in 3.12
+_collections_abc\.ByteString
+typing\.ByteString
+
 _collections_abc.Callable  # Typing-related weirdness
 _collections_abc.Mapping.get  # Adding None to the Union messed up mypy
 _collections_abc.Sequence.index  # Supporting None in end is not mandatory

stdlib/@tests/stubtest_allowlists/py310.txt

@@ -155,19 +155,12 @@ tkinter.tix.TkVersion
 # <= 3.13
 # =======
 
-# Pretend typing.ByteString is a Union, to better match its documented semantics.
-# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
-# because it's not an ABC that makes any sense and was deprecated in 3.12
-_collections_abc.ByteString
-
 ast.Ellipsis.__new__  # Implementation has *args, but shouldn't allow any
 
 _?hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 
 importlib.abc.Traversable.open  # Problematic protocol signature at runtime, see source code comments.
 
-typing\.ByteString
-
 # Will always raise. Not included to avoid type checkers inferring that
 # TypeAliasType instances are callable.
 typing_extensions.TypeAliasType.__call__

stdlib/@tests/stubtest_allowlists/py311.txt

@@ -121,19 +121,12 @@ tkinter.tix.TkVersion
 # <= 3.13
 # =======
 
-# Pretend typing.ByteString is a Union, to better match its documented semantics.
-# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
-# because it's not an ABC that makes any sense and was deprecated in 3.12
-_collections_abc.ByteString
-
 ast.Ellipsis.__new__  # Implementation has *args, but shouldn't allow any
 
 _?hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 
 importlib.abc.Traversable.open  # Problematic protocol signature at runtime, see source code comments.
 
-typing\.ByteString
-
 # Will always raise. Not included to avoid type checkers inferring that
 # TypeAliasType instances are callable.
 typing_extensions.TypeAliasType.__call__

stdlib/@tests/stubtest_allowlists/py312.txt

@@ -120,19 +120,12 @@ tkinter.tix.TkVersion
 # <= 3.13
 # =======
 
-# Pretend typing.ByteString is a Union, to better match its documented semantics.
-# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
-# because it's not an ABC that makes any sense and was deprecated in 3.12
-_collections_abc.ByteString
-
 ast.Ellipsis.__new__  # Implementation has *args, but shouldn't allow any
 
 _?hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 
 importlib.abc.Traversable.open  # Problematic protocol signature at runtime, see source code comments.
 
-typing\.ByteString
-
 # Will always raise. Not included to avoid type checkers inferring that
 # TypeAliasType instances are callable.
 typing_extensions.TypeAliasType.__call__

stdlib/@tests/stubtest_allowlists/py313.txt

@@ -81,19 +81,12 @@ typing(_extensions)?\.IO\.writelines
 # <= 3.13
 # =======
 
-# Pretend typing.ByteString is a Union, to better match its documented semantics.
-# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
-# because it's not an ABC that makes any sense and was deprecated in 3.12
-_collections_abc.ByteString
-
 ast.Ellipsis.__new__  # Implementation has *args, but shouldn't allow any
 
 _?hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 
 importlib.abc.Traversable.open  # Problematic protocol signature at runtime, see source code comments.
 
-typing\.ByteString
-
 # Will always raise. Not included to avoid type checkers inferring that
 # TypeAliasType instances are callable.
 typing_extensions.TypeAliasType.__call__

stdlib/@tests/stubtest_allowlists/py39.txt

@@ -18,7 +18,7 @@ collections.AsyncGenerator.__anext__  # async at runtime, deliberately not in th
 collections.AsyncGenerator.aclose  # async at runtime, deliberately not in the stub, see #7491
 collections.AsyncGenerator.asend  # async at runtime, deliberately not in the stub, see #7491. Pos-only differences also.
 collections.AsyncIterator.__anext__  # async at runtime, deliberately not in the stub, see #7491
-collections.ByteString  # see comments in py3_common.txt
+collections.ByteString  # see comments in common.txt
 collections.Callable
 collections.Mapping.get  # Adding None to the Union messed up mypy
 collections.Sequence.index  # Supporting None in end is not mandatory
@@ -104,19 +104,12 @@ tkinter.tix.TkVersion
 # <= 3.13
 # =======
 
-# Pretend typing.ByteString is a Union, to better match its documented semantics.
-# As a side effect, this changes the definition of collections.abc.ByteString, which is okay,
-# because it's not an ABC that makes any sense and was deprecated in 3.12
-_collections_abc.ByteString
-
 ast.Ellipsis.__new__  # Implementation has *args, but shouldn't allow any
 
 _?hashlib.scrypt  # Raises TypeError if salt, n, r or p are None
 
 importlib.abc.Traversable.open  # Problematic protocol signature at runtime, see source code comments.
 
-typing\.ByteString
-
 # Will always raise. Not included to avoid type checkers inferring that
 # TypeAliasType instances are callable.
 typing_extensions.TypeAliasType.__call__

stdlib/_collections_abc.pyi

@@ -1,12 +1,13 @@
 import sys
 from abc import abstractmethod
 from types import MappingProxyType
-from typing import (  # noqa: Y022,Y038,UP035
+from typing import (  # noqa: Y022,Y038,UP035,Y057
     AbstractSet as Set,
     AsyncGenerator as AsyncGenerator,
     AsyncIterable as AsyncIterable,
     AsyncIterator as AsyncIterator,
     Awaitable as Awaitable,
+    ByteString as ByteString,
     Callable as Callable,
     ClassVar,
     Collection as Collection,
@@ -59,12 +60,8 @@ __all__ = [
     "ValuesView",
     "Sequence",
     "MutableSequence",
+    "ByteString",
 ]
-if sys.version_info < (3, 14):
-    from typing import ByteString as ByteString  # noqa: Y057,UP035
-
-    __all__ += ["ByteString"]
-
 if sys.version_info >= (3, 12):
     __all__ += ["Buffer"]
 

stdlib/typing.pyi

@@ -41,6 +41,7 @@ __all__ = [
     "AsyncIterator",
     "Awaitable",
     "BinaryIO",
+    "ByteString",
     "Callable",
     "ChainMap",
     "ClassVar",
@@ -109,9 +110,6 @@ __all__ = [
     "runtime_checkable",
 ]
 
-if sys.version_info < (3, 14):
-    __all__ += ["ByteString"]
-
 if sys.version_info >= (3, 14):
     __all__ += ["evaluate_forward_ref"]
 
@@ -923,8 +921,7 @@ class TextIO(IO[str]):
     @abstractmethod
     def __enter__(self) -> TextIO: ...
 
-if sys.version_info < (3, 14):
-    ByteString: typing_extensions.TypeAlias = bytes | bytearray | memoryview
+ByteString: typing_extensions.TypeAlias = bytes | bytearray | memoryview
 
 # Functions