[issue38604] Schedule Py_UNICODE API removal

[STINNER Victor]

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

A preleminary step was to modify PyUnicode_AsWideChar() and PyUnicode_AsWideCharString() to remove the internal caching: it has been done in Python 3.8.0 with bpo-30863.

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nosy: +inada.naoki, serhiy.storchaka

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<https://bugs.python.org/issue38604>
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