Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

> About subclasses, I'm not sure if it's safe to call the traverse function if 
> a subclass overrides it and visits its own member which are not in the 
> built-in type (like dict or tuple).

Technically the traverse should only call visit on the members, but in practice 
they can do whatever. I agree is not clear is a safe operation

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44531>
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