bpo-46603: improve coverage of typing._strip_annotations (GH-31063)

(cherry picked from commit 25c0b9d)

Co-authored-by: Nikita Sobolev <[email protected]>

Author: miss-islington

Lib/test/test_typing.py

@@ -3305,6 +3305,15 @@ def barfoo4(x: BA3): ...
             {"x": typing.Annotated[int | float, "const"]}
         )
 
+    def test_get_type_hints_annotated_in_union(self):  # bpo-46603
+        def with_union(x: int | list[Annotated[str, 'meta']]): ...
+
+        self.assertEqual(get_type_hints(with_union), {'x': int | list[str]})
+        self.assertEqual(
+            get_type_hints(with_union, include_extras=True),
+            {'x': int | list[Annotated[str, 'meta']]},
+        )
+
     def test_get_type_hints_annotated_refs(self):
 
         Const = Annotated[T, "Const"]