[issue18713] Enable surrogateescape on stdin and stdout when appropriate

[STINNER Victor]

STINNER Victor added the comment:

>>> ('\udcff' + 'qwerty').encode('utf-16le', 'surrogateescape')
b'\xff\xdcq\x00w\x00e\x00r\x00t\x00y\x00'

Oh, this is a bug in the UTF-16 encoder: it should not encode surrogate characters => see issue #12892

I read that it's possible to set a standard stream like stdout in UTF-16 mode on Windows. I don't know if it's commonly used, nor it would impact Python. I never see a platform using UTF-16 or UTF-32 for standard streams.

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<http://bugs.python.org/issue18713>
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