Martin v. Löwis <mar...@v.loewis.de> added the comment:

I agree that the codec shouldn't "decode" unicode strings. However, the 
operation performed is still meaningful: users may type ACE 
(ascii-compatibly-encoded) DNS names into a user interface, and the application 
may then represent this as a "proper" Unicode name.

So I propose these changes:

- remove support for bytes in codec, but only so for 3.3 (it's actually no 
change in behavior, since it will continue to raise TypeErrors)
- add a function decode_idna to the module, for users that wish to un-IDNA 
string objects.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue3232>
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