STINNER Victor added the comment:

>>> codecs.utf_8_decode('\u20ac'.encode('utf8')[:2])
('', 0)

Oh... codecs.CODEC_decode are incremental decoders? I misunderstood completly 
this.

"The bug is an issue in the design of codecs.Stream* classes: incremental 
decoders and encoders should be used instead of classic decoders/encoders."

Hum, I suppose that the issue cannot be reproduded with TextIOWrapper, just 
because io.TextIOWrapper and codecs.StreamReader use different buffer sizes.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15278>
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