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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Blacklisting by name is slow and it prevents a user from defining a codec with blacklisted name.

What if just add private attribute ("_not_text"?) to unsafe codecs? If a codec has this attribute, than it should not be used it text encoding/decoding. Checking an attribute is much faster than comparing with a couple of strings.

Another possibility is an inheriting all unsafe codecs from special class.

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