Another comparison patch-up: comparing a type with a dynamic metatype
to one with a static metatype raised an obscure error.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 20c149e..027a568 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -2033,7 +2033,8 @@
 
 	if (!PyArg_ParseTuple(args, "O", &other))
 		return NULL;
-	if (!PyType_IsSubtype(other->ob_type, self->ob_type)) {
+	if (other->ob_type->tp_compare != func &&
+	    !PyType_IsSubtype(other->ob_type, self->ob_type)) {
 		PyErr_Format(
 			PyExc_TypeError,
 			"%s.__cmp__(x,y) requires y to be a '%s', not a '%s'",