[issue28866] Type cache is not correctly invalidated on a class defining mro()

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

A refcount problem possibly caused by the fix: https://bugs.python.org/issue39016

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nosy: +petr.viktorin

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<https://bugs.python.org/issue28866>
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