Make sure that `ReadOnly` is removed when using `get_type_hints(include_extra=False)` (#349)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 07fc328..a545e25 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Release 4.11.0 (WIP)
+
+- When `include_extra=False`, `get_type_hints()` now strips `ReadOnly` from the annotation.
+
 # Release 4.10.0 (February 24, 2024)
 
 This feature release adds support for PEP 728 (TypedDict with extra

doc/index.rst

diff --git a/doc/index.rst b/doc/index.rst
index 63082dd..bdf94c7 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -760,6 +760,11 @@
 
       Interaction with :data:`Required` and :data:`NotRequired`.
 
+   .. versionchanged:: 4.11.0
+
+      When ``include_extra=False``, ``get_type_hints()`` now strips
+      :data:`ReadOnly` from the annotation.
+
 .. function:: is_protocol(tp)
 
    Determine if a type is a :class:`Protocol`. This works with protocols

src/test_typing_extensions.py

diff --git a/src/test_typing_extensions.py b/src/test_typing_extensions.py
index 79c1b88..d48880f 100644
--- a/src/test_typing_extensions.py
+++ b/src/test_typing_extensions.py
@@ -4199,6 +4199,20 @@
         self.assertEqual(AllTheThings.__readonly_keys__, frozenset({'a', 'b', 'c'}))
         self.assertEqual(AllTheThings.__mutable_keys__, frozenset({'d'}))
 
+        self.assertEqual(
+            get_type_hints(AllTheThings, include_extras=False),
+            {'a': int, 'b': int, 'c': int, 'd': int},
+        )
+        self.assertEqual(
+            get_type_hints(AllTheThings, include_extras=True),
+            {
+                'a': Annotated[Required[ReadOnly[int]], 'why not'],
+                'b': Required[Annotated[ReadOnly[int], 'why not']],
+                'c': ReadOnly[NotRequired[Annotated[int, 'why not']]],
+                'd': NotRequired[Annotated[int, 'why not']],
+            },
+        )
+
     def test_extra_keys_non_readonly(self):
         class Base(TypedDict, closed=True):
             __extra_items__: str

src/typing_extensions.py

diff --git a/src/typing_extensions.py b/src/typing_extensions.py
index f3132ea..4499c61 100644
--- a/src/typing_extensions.py
+++ b/src/typing_extensions.py
@@ -1122,15 +1122,15 @@
         return val
 
 
-if hasattr(typing, "Required"):  # 3.11+
+if hasattr(typing, "ReadOnly"):  # 3.13+
     get_type_hints = typing.get_type_hints
-else:  # <=3.10
+else:  # <=3.13
     # replaces _strip_annotations()
     def _strip_extras(t):
         """Strips Annotated, Required and NotRequired from a given type."""
         if isinstance(t, _AnnotatedAlias):
             return _strip_extras(t.__origin__)
-        if hasattr(t, "__origin__") and t.__origin__ in (Required, NotRequired):
+        if hasattr(t, "__origin__") and t.__origin__ in (Required, NotRequired, ReadOnly):
             return _strip_extras(t.__args__[0])
         if isinstance(t, typing._GenericAlias):
             stripped_args = tuple(_strip_extras(a) for a in t.__args__)