[issue39599] ABI breakage between Python 3.7.4 and 3.7.5: change in PyGC_Head structure

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> _Py_AS_GC and all APIs to get PyGC_Head from PyObject* are not only unstable, but also private.

Understood; thanks. I agree that there shouldn't be a guarantee for private undocumented calls.

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<https://bugs.python.org/issue39599>
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