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

[Roundup Robot]

Roundup Robot added the comment:

New changeset f3ec00d2b75e by Nick Coghlan in branch 'default':
Close #20404: blacklist non-text encodings in io.TextIOWrapper
http://hg.python.org/cpython/rev/f3ec00d2b75e

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<http://bugs.python.org/issue19619>
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