[issue39573] [C API] Make PyObject an opaque structure in the limited C API

[STINNER Victor]

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

Most projects broken by Py_TYPE and Py_SIZE changes have been fixed since last year. I succeeded to use my new pythoncapi_compat project on multiple C extensions. So I propose again to convert Py_TYPE and Py_SIZE macros to static inline functions: https://github.com/python/cpython/pull/26493

I also proposed to promote the pythoncapi_compat project in the "C API: Porting to Python 3.10" section of "What's New In Python 3.10?" on python-dev:
https://mail.python.org/archives/list/python-dev@python.org/thread/KHDZGCNOYEDUTSPAATUDP55ZSSQM5RRC/

I already announced the pythoncapi_compat project on the capi-sig last December:
https://mail.python.org/archives/list/capi-sig@python.org/thread/LFLXFMKMZ77UCDUFD5EQCONSAFFWJWOZ/

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