Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.
This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index aaac660..d4cc960 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -1103,7 +1103,7 @@
Py_ssize_t res;
Py_ssize_t blocks;
- res = sizeof(dequeobject);
+ res = _PyObject_SIZE(Py_TYPE(deque));
blocks = (deque->leftindex + deque->len + BLOCKLEN - 1) / BLOCKLEN;
assert(deque->leftindex + deque->len - 1 ==
(blocks - 1) * BLOCKLEN + deque->rightindex);