Eli Bendersky <eli...@gmail.com> added the comment: No need, the cause for the segfault is known. What happens is that Element objects from the Python module get intermixed with Element objects from the C module, and these are incompatible. The C module traversal functions assume they can cast Elements to a known structure (ElementObject), and when they get the invalid Elements they crash. Adding runtime checks everywhere is too costly. This situation cannot arise in a valid way.
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