Message 359916 - Python tracker

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> One further step would be to change the VECTORCALL/FASTCALL calling convention to pass tstate. But I am not sure what is the risk to do that in Python 3.9? Cython uses FASTCALL internally for example.

I started a thread on python-dev:
https://mail.python.org/archives/list/python-dev@python.org/thread/PIXJAJPWKDGHSQD65VOO2B7FDLU2QLHH/

I also wrote an article on this issue, "Pass the Python thread state explicitly":
https://vstinner.github.io/cpython-pass-tstate.html