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