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

[STINNER Victor]

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

I created the https://github.com/pythoncapi/upgrade_pythoncapi project which updates automatically a C extension to newer C API. For example, it uses Py_TYPE(), Py_SIZE(), Py_REFCNT(), Py_SET_SIZE(), Py_SET_SIZE() and Py_SET_REFCNT() functions.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39573>
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