Re: [DNSOP] Status of IDNA

[Viktor Dukhovni <[e-mail]>]

On Wed, Apr 12, 2017 at 07:45:41PM -0400, Andrew Sullivan wrote:

> On Wed, Apr 12, 2017 at 03:47:14PM +0000, Viktor Dukhovni wrote:
>
> > Just move on to non-transitional UTS#46.
> 
> Given that its mappings include many emojis, which aren't allowed
> under either IDNA2003 or IDNA2008, I think there is an apparent
> problem with UTS#46 too.  One might be forgiven for wondering why the
> UTC decided that it knew something about domain names and the history
> of how they are used.

Well, IIRC they sensibly converged on a case-folded normal form
that ensures that https://Духовный.org maps to the same underlying
wire-form domain as https://духовный.org, i.e. both result in
queries for xn--b1adqpd3ao5c.org.  AFAIK, those would generally be
different domains under IDNA2008.

While is true that UTS#46 maps <U+1F4A9>.org to xn--ls8h.org, (see
http://www.fileformat.info/info/unicode/char/1f4a9/index.htm) that
seems to be a small price to pay for avoing surprising case-sensitive
behaviour.

-- 
	Viktor.