refactor

Author: eendebakpt

Objects/listobject.c

@@ -3929,7 +3929,7 @@ listiter_dealloc(PyObject *self)
     _PyListIterObject *it = (_PyListIterObject *)self;
     _PyObject_GC_UNTRACK(it);
     Py_XDECREF(it->it_seq);
-    assert(Py_TYPE(self)==_PyListIterObject);
+    assert(Py_IS_TYPE(self, &PyListIter_Type));
     _Py_FREELIST_FREE(list_iters, it, PyObject_GC_Del);
 }
 

Objects/tupleobject.c

@@ -996,6 +996,7 @@ tupleiter_dealloc(PyObject *self)
     _PyTupleIterObject *it = _PyTupleIterObject_CAST(self);
     _PyObject_GC_UNTRACK(it);
     Py_XDECREF(it->it_seq);
+    assert(Py_IS_TYPE(self, &PyTupleIter_Type));
     _Py_FREELIST_FREE(tuple_iters, it, PyObject_GC_Del);
 }