[issue32388] Remove cross-version binary compatibility

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Does it mean that Python 3.8 wil crash on loading C extensions compiled on Python older than this version?

What makes you think that it would be otherwise be able to load and execute such C extensions without any bugs?

There is no ABI except the stable ABI, and tp_flags isn't part of the stable ABI. 

PS : tp_finalize is in Python 3.4, but that doesn't really matter.

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<https://bugs.python.org/issue32388>
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