Sigh. Strengthen the resriction of the previous checkin: tp_new is

gvanrossum · gvanrossum · commit 29687cd2112c · 2001-08-09T19:43:37.000Z
inherited unless *both*: (a) the base type is 'object', and (b) the
subtype is not a "heap" type.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
@@ -1152,7 +1152,8 @@ inherit_slots(PyTypeObject *type, PyTypeObject *base)
 		COPYSLOT(tp_dictoffset);
 		COPYSLOT(tp_init);
 		COPYSLOT(tp_alloc);
-		if (type->tp_flags & Py_TPFLAGS_HEAPTYPE) {
+		if (base != &PyBaseObject_Type ||
+		    (type->tp_flags & Py_TPFLAGS_HEAPTYPE)) {
 			COPYSLOT(tp_new);
 		}
 		COPYSLOT(tp_free);
