Raymond Hettinger added the comment: The builtins make direct calls to their own internal methods. This has existed for a long time. It would be hard to change without crushing performance. Changing it violates Meyer's open-closed principle. And changing it also introduces weird, unexpected behaviors (i.e. a seemingly innocent method override can break pickling for an object -- we had a bug report on this once for dicts and sets). Also, making these kind of changes makes it *much* harder for a builtin to guarantee that it invariants are maintained and opening the door for segfaults.
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