STINNER Victor <vstin...@python.org> added the comment:

> How is that going to help third party extensions and subclasses?

It doesn't solve bpo-40142 issue for third party extensions.

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).

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