[issue25349] Use _PyBytesWriter for bytes%args

[STINNER Victor]

STINNER Victor added the comment:

bytes_formatlong.patch: Fast-path for b'%d' % int and other integer formatters. It avoids the creation of a temporary bytes object, it writes directly into the writer, as '%d' % int (Unicode).

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Added file: http://bugs.python.org/file40732/bytes_formatlong.patch

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<http://bugs.python.org/issue25349>
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