[issue30863] Rewrite PyUnicode_AsWideChar() and PyUnicode_AsWideCharString()

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +2667

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30863>
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