STINNER Victor <victor.stin...@haypocalc.com> added the comment:

Python 3.3 has a strange behaviour:

>>> '\uDBFF\uDFFF'.encode('utf-16-le').decode('utf-16-le')
'\U0010ffff'
>>> '\U0010ffff'.encode('utf-16-le').decode('utf-16-le')
'\U0010ffff'

I would expect text.decode(encoding).encode(encoding)==text or an encode or 
decode error.

So I agree that the encoder should reject lone surogates.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12892>
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