[issue36381] Deprecate "#" argument format without PY_SSIZE_T_CLEAN

[STINNER Victor]

Change by STINNER Victor <vstinner at redhat.com>:


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title: Preapre for mandatory PY_SSIZE_T_CLEAN -> Deprecate "#" argument format without PY_SSIZE_T_CLEAN

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36381>
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