[Python-ideas] Fix default encodings on Windows

[Victor Stinner]

> The last point is correct: if you get bytes from a file system API, you
should be able to pass them back in without losing information. CP_ACP
(a.k.a. the *A API) does not allow this, so I'm proposing using the *W API
everywhere and encoding to utf-8 when the user wants/gives bytes.

You get troubles when the filename comes a file, another application, a
registry key, ... which is encoded to CP_ACP.

Do you plan to transcode all these data? (decode from CP_ACP, encode back
to UTF-8)
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