Add an exact type match fast path for deque_copy().
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 17233e4..49a46a1 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1205,6 +1205,22 @@
static PyObject *
deque_copy(PyObject *deque)
{
+ if (Py_TYPE(deque) == &deque_type) {
+ dequeobject *new_deque;
+ PyObject *rv;
+
+ new_deque = (dequeobject *)deque_new(&deque_type, (PyObject *)NULL, (PyObject *)NULL);
+ if (new_deque == NULL)
+ return NULL;
+ new_deque->maxlen = ((dequeobject *)deque)->maxlen;
+ rv = deque_extend(new_deque, deque);
+ if (rv != NULL) {
+ Py_DECREF(rv);
+ return (PyObject *)new_deque;
+ }
+ Py_DECREF(new_deque);
+ return NULL;
+ }
if (((dequeobject *)deque)->maxlen == -1)
return PyObject_CallFunction((PyObject *)(Py_TYPE(deque)), "O", deque, NULL);
else