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

[Nick Coghlan]

Nick Coghlan added the comment:

Yes, a private attribute on CodecInfo is probably better - the rest of the
patch would stay the same, it would just check for that attribute instead
of particular names.

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