Comments on draft-ietf-idnabis-defs-10

[Andrew Sullivan]

On Tue, Sep 01, 2009 at 02:14:37PM +1000, James Mitchell wrote:
> 
> Punycode does not require output to be in any particular case.  I
> have copied from RFC3492 Page 8 below for convenience
> 
> 'An encoder SHOULD output only uppercase forms or only lowercase
> forms, unless it uses mixed-case annotation'
> 
> Therefore KGBECHTV and kgbechtv are both valid outputs of the
> punycode algorithm.

Hrm, so actually it is possible that all ASCII characters in an
A-label are upper case, even though the input from the U-label is not
allowed to have upper case in them.  This seems to be bad, because the
returned result from the Punycode decoding could make the U-label
ASCII characters upper case, right?

A

-- 
Andrew Sullivan
ajs at shinkuro.com
Shinkuro, Inc.