[issue19619] Blacklist base64, hex, ... codecs from bytes.decode() and str.encode()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think that issue20404 should be backported too. It is common to wrap socket stream with io.TextIOWrapper, and socket.makefile() returns text stream by default.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19619>
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