[issue17742] Add _PyBytesWriter API

[STINNER Victor]

STINNER Victor added the comment:

_PyBytesWriter API makes the code slower and does not really reduce the number of lines, so I'm closing this issue as invalid.

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resolution:  -> invalid
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17742>
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