STINNER Victor added the comment:
Note: it is not possible to reencode the buffer of decoded characters to
compute the offset in bytes. Some codecs are not bijective.
Examples:
* b'\x00'.decode('utf7').encode('utf7') == b'+AAA-'
* b'\xff'.decode('ascii', 'replace').encode('ascii', 'replace') == b'?'
* b'\xff'.decode('ascii', 'ignore').encode('ascii', 'ignore') == b''
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<http://bugs.python.org/issue15216>
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