[issue12508] Codecs Anomaly

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

AFAIU final means:
  * final=0: I'm passing in a few bytes, but there are more to come, so if the last byte(s) doesn't make sense on its own (e.g. it's a start byte but the continuation bytes are missing), wait for the others before raising an error;
  * final=1: these are the last bytes, so if the last byte(s) doesn't make sense raise an error (or ignore/replace) because there won't be other bytes that might turn that in a well-formed byte sequence.

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<http://bugs.python.org/issue12508>
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