[issue20405] Add io.BinaryTransformWrapper and a "transform" parameter to open()

[STINNER Victor]

STINNER Victor added the comment:

I agree with Antoine, I dislike the idea of BinaryTransformWrapper, it remembers me the evil codecs.EncodedFile thing.

What are the usecases?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20405>
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