Updating RFC 5890-5893 (IDNA 2008) to Full Standard

[John C Klensin]

--On Friday, November 16, 2012 15:59 -0800 Mark Davis ☕
<mark at macchiato.com> wrote:

>> Mapping is not part of IDNA2008
> 
> I specifically did not say it was.
> 
> Option 1 is clearly *not* IDNA2008. That is option 2.
> 
> If Option 1 is expressed so as to accurately represent an
> alternative approach that does maintain compatibility, then it
> includes mapping.

And retaining mapping as part of the protocol rejects the notion
that having a dual relationship between A-labels and U-labels is
very important (or even just important).  The WG considered it
quite important.  See Vint's note.  Also remember that IDNA is
not just about the web and that other protocols that use domain
names as part of identifiers (sometimes without resolving them)
may have their own guidance about comparison of those
identifiers.

best,
   john