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

[STINNER Victor]

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

See also bpo-40881 "--with-valgrind broken": unicode_release_interned() still used "Py_REFCNT(s) += 1;". It's now fixed by commit c96a61e8163c2d25ed4ac77cf96201fd0bdb945c.

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