[issue43510] PEP 597: Implemente encoding="locale" option and EncodingWarning

[Inada Naoki]

Change by Inada Naoki <songofacandy at gmail.com>:


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pull_requests: +23852
pull_request: https://github.com/python/cpython/pull/25108

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<https://bugs.python.org/issue43510>
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