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

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

> Since the final goal is to move everybody towards to UTF-8, I'm not sure how it's a good thing.

The final goal (the third motivation of the pep 597) is changing the default encoding (i.e. encoding used when it is not specified) to UTF-8.

But forcing people to use UTF-8 even they specify locale encoding explicitly is not the goal. That's why I want to ignore UTF-8 mode when `encoding="locale"` is specified.

I think this is almost Windows-only issue, and "mbcs" can be used in Windows already. It is documented in https://docs.python.org/3/using/windows.html#utf-8-mode

So this is not a blocker. Just my preference.

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