inspect.signature: Use 'inspect.isbuiltin' in 'Signature.from_builtin'
diff --git a/Lib/inspect.py b/Lib/inspect.py
index a65aafd..4e33a22 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1594,8 +1594,9 @@
def _signature_is_builtin(obj):
# Internal helper to test if `obj` is a callable that might
# support Argument Clinic's __text_signature__ protocol.
- return (isinstance(obj, _NonUserDefinedCallables) or
+ return (isbuiltin(obj) or
ismethoddescriptor(obj) or
+ isinstance(obj, _NonUserDefinedCallables) or
# Can't test 'isinstance(type)' here, as it would
# also be True for regular python classes
obj in (type, object))