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

[STINNER Victor]

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

Note: numpy was updated to also the use the macros using ", (void)0":
https://github.com/numpy/numpy/commit/f1671076c80bd972421751f2d48186ee9ac808aa

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<https://bugs.python.org/issue39573>
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