Rework version dependent code + add change log.

CHANGES.rst

@@ -5,7 +5,11 @@
 7.1.2 (unreleased)
 ==================
 
-- Add preliminary support for Python 3.14a2.
+- Add preliminary support for Python 3.14a2, this means that
+  ``.common.builtins.IByteString`` and ``.common.collections.IByteString`` are
+  no longer available from this version onwards as Python 3.14 dropped
+  ``collections.abc.ByteString``.
+
 
 7.1.1 (2024-10-23)
 ==================

src/zope/interface/_compat.py

@@ -22,7 +22,7 @@
 import sys
 
 
-PY314_OR_GREATER = sys.version_info >= (3, 14)
+PY313_OR_OLDER = sys.version_info < (3, 14)
 
 
 def _normalize_name(name):

src/zope/interface/common/builtins.py

@@ -19,7 +19,7 @@
 """
 
 from zope.interface import classImplements
-from zope.interface._compat import PY314_OR_GREATER
+from zope.interface._compat import PY313_OR_OLDER
 from zope.interface.common import collections
 from zope.interface.common import io
 from zope.interface.common import numbers
@@ -68,7 +68,7 @@ class ITextString(collections.ISequence):
     extra_classes = (str,)
 
 
-if not PY314_OR_GREATER:
+if PY313_OR_OLDER:
     class IByteString(collections.IByteString):
         """
         Interface for immutable byte strings.

src/zope/interface/common/collections.py

@@ -38,7 +38,7 @@
 from collections import UserString
 from collections import abc
 
-from zope.interface._compat import PY314_OR_GREATER
+from zope.interface._compat import PY313_OR_OLDER
 from zope.interface.common import ABCInterface
 from zope.interface.common import optional
 
@@ -191,7 +191,7 @@ class IMutableSequence(ISequence):
     extra_classes = (UserList,)
 
 
-if not PY314_OR_GREATER:
+if PY313_OR_OLDER:
     class IByteString(ISequence):
         """
         This unifies `bytes` and `bytearray`.

src/zope/interface/common/tests/test_builtins.py

@@ -12,7 +12,7 @@
 
 import unittest
 
-from zope.interface._compat import PY314_OR_GREATER
+from zope.interface._compat import PY313_OR_OLDER
 from zope.interface.common import builtins
 
 from . import VerifyClassMixin
@@ -35,7 +35,7 @@ class TestVerifyClass(VerifyClassMixin,
     (builtins.IFile, ()),
 
 ]
-if not PY314_OR_GREATER:
+if PY313_OR_OLDER:
     VERIFY_TESTS.append(
         (builtins.IByteString, (bytes,))
     )