[issue39573] [C API] Avoid accessing PyObject and PyVarObject members directly: add Py_SET_TYPE() and Py_IS_TYPE(), disallow Py_TYPE(obj)=type

[STINNER Victor]

STINNER Victor <vstin...@python.org> added the comment:

I wrote an article about these changes:
https://vstinner.github.io/c-api-abstract-pyobject.html

It elaborates the rationale for making these changes.

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