[idn] Roundup on optional characters

[Paul Hoffman / IMC <phoffman@imc.org>]

A few themes have emerged from this discussion:

- Some people like the idea of optional characters in scripts where 
there are common use for them. Of the people who actually chose 
between (a) [optional], (b) [prohibited], and (c) [allowed as 
normal], they chose (a).

- Some people believe that the IETF is not the right place for this 
decision, mostly pointing towards the Unicode Consortium. It was 
noted that the Unicode Consortium hasn't done anything with optional 
characters yet and, if it does in the future, it won't affect the 
canonicalization in UTR 15 (which is stable for currently-assigned 
characters).

- There may be other scripts for which optional character treatment 
is relevant (although no one has given any specifics).

If there is not general agreement, I'll leave this part of the 
nameprep document as it is now, which is essentially the same as 
choosing (c) [allowed as normal].

--Paul Hoffman, Director
--Internet Mail Consortium