Update PEP 649/749 implementation

Author: JelleZijlstra

src/test_typing_extensions.py

@@ -29,7 +29,6 @@
 from _typed_dict_test_helper import Foo, FooGeneric, VeryAnnotated
 from typing_extensions import (
     _FORWARD_REF_HAS_CLASS,
-    _PEP_649_OR_749_IMPLEMENTED,
     Annotated,
     Any,
     AnyStr,
@@ -8533,7 +8532,7 @@ def test_stock_annotations_in_module(self):
             get_annotations(isa.MyClass, format=Format.STRING),
             {"a": "int", "b": "str"},
         )
-        mycls = "MyClass" if _PEP_649_OR_749_IMPLEMENTED else "inspect_stock_annotations.MyClass"
+        mycls = "MyClass" if sys.version_info >= (3, 14) else "inspect_stock_annotations.MyClass"
         self.assertEqual(
             get_annotations(isa.function, format=Format.STRING),
             {"a": "int", "b": "str", "return": mycls},
@@ -8581,7 +8580,7 @@ def test_stock_annotations_on_wrapper(self):
             get_annotations(wrapped, format=Format.FORWARDREF),
             {"a": int, "b": str, "return": isa.MyClass},
         )
-        mycls = "MyClass" if _PEP_649_OR_749_IMPLEMENTED else "inspect_stock_annotations.MyClass"
+        mycls = "MyClass" if sys.version_info >= (3, 14) else "inspect_stock_annotations.MyClass"
         self.assertEqual(
             get_annotations(wrapped, format=Format.STRING),
             {"a": "int", "b": "str", "return": mycls},

src/typing_extensions.py

@@ -3821,27 +3821,15 @@ def __eq__(self, other: object) -> bool:
     __all__.append("CapsuleType")
 
 
-# Using this convoluted approach so that this keeps working
-# whether we end up using PEP 649 as written, PEP 749, or
-# some other variation: in any case, inspect.get_annotations
-# will continue to exist and will gain a `format` parameter.
-_PEP_649_OR_749_IMPLEMENTED = (
-    hasattr(inspect, 'get_annotations')
-    and inspect.get_annotations.__kwdefaults__ is not None
-    and "format" in inspect.get_annotations.__kwdefaults__
-)
-
-
-class Format(enum.IntEnum):
-    VALUE = 1
-    VALUE_WITH_FAKE_GLOBALS = 2
-    FORWARDREF = 3
-    STRING = 4
-
-
-if _PEP_649_OR_749_IMPLEMENTED:
-    get_annotations = inspect.get_annotations
+if sys.version_info >= (3,14):
+    from annotationlib import get_annotations, Format
 else:
+    class Format(enum.IntEnum):
+        VALUE = 1
+        VALUE_WITH_FAKE_GLOBALS = 2
+        FORWARDREF = 3
+        STRING = 4
+
     def get_annotations(obj, *, globals=None, locals=None, eval_str=False,
                         format=Format.VALUE):
         """Compute the annotations dict for an object.
@@ -4122,7 +4110,7 @@ def evaluate_forward_ref(
         globals=None,
         locals=None,
         type_params=None,
-        format=Format.VALUE,
+        format=None,
         _recursive_guard=frozenset(),
     ):
         """Evaluate a forward reference as a type hint.