bpo-42195: Ensure consistency of Callable's __args__ in collections.abc and typing (GH-23060)
diff --git a/Objects/unionobject.c b/Objects/unionobject.c
index 2308bfc..32aa507 100644
--- a/Objects/unionobject.c
+++ b/Objects/unionobject.c
@@ -237,8 +237,8 @@ dedup_and_flatten_args(PyObject* args)
PyObject* i_element = PyTuple_GET_ITEM(args, i);
for (Py_ssize_t j = i + 1; j < arg_length; j++) {
PyObject* j_element = PyTuple_GET_ITEM(args, j);
- int is_ga = Py_TYPE(i_element) == &Py_GenericAliasType &&
- Py_TYPE(j_element) == &Py_GenericAliasType;
+ int is_ga = PyObject_TypeCheck(i_element, &Py_GenericAliasType) &&
+ PyObject_TypeCheck(j_element, &Py_GenericAliasType);
// RichCompare to also deduplicate GenericAlias types (slower)
is_duplicate = is_ga ? PyObject_RichCompareBool(i_element, j_element, Py_EQ)
: i_element == j_element;
@@ -296,7 +296,7 @@ is_unionable(PyObject *obj)
is_new_type(obj) ||
is_special_form(obj) ||
PyType_Check(obj) ||
- type == &Py_GenericAliasType ||
+ PyObject_TypeCheck(obj, &Py_GenericAliasType) ||
type == &_Py_UnionType);
}