[issue39824] Multi-phase extension module (PEP 489): don't call m_traverse, m_clear nor m_free before the module state is allocated

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

> I think Cython makes use of PEP-489 so unless I am missing something all generated extensions use PEP-489 structures.

Cython doesn't make complete use of PEP-489 yet, specifically not of the module state feature (nor module subclasses). This change looks good from my side. Good idea, Victor.

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