[issue38304] PEP 587 implementation is not ABI forward compatible

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> The hidden _config_version field wasn't in the accepted PEP.

It was in the accepted PEP and I replaced it with struct_size:
https://github.com/python/peps/commit/afa38c0bef7738b8fcc3173daee8488e0420833d

I suggest to discuss the issue on the thread that I started on python-dev.

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<https://bugs.python.org/issue38304>
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