Re: [idn] SC/TC equivalence

["Adam M. Costello" <amc@cs.berkeley.edu>]

liana.ydisg@juno.com wrote:

> [nameprep] is the place for case folding for Latin, then it should be
> the place for other script folding as well.

That's a valid argument, but there are also some counter-arguments:

Existing domain names are already case-insensitive, so IDNs ought to
be case-insensitive for consistency with the current standard.  This
consistency constraint does not apply to SC/TC equivalence.

With very few exceptions, case mapping is one-to-one.  SC/TC mapping is
more complex more often.

The case mapping rules are already defined in the Unicode standard.
This is not true for SC/TC mapping.

Some people have expressed a desire to be able to register the
simplified and traditional versions of a name as separate domain names.
No one has expressed an analogous desire to be able to register the
all-uppercase and all-lowercase versions of a name as separate domain
names.

AMC