Re: [idn] Fast nameprep vs. slow nameprep

[Keith Moore]

this is indeed a helpful list, as it helps identify at least part of 
the difference in assumptions.

my assumption is that for most languages and most people's platforms 
the "keyboard interface" for entry of DNS names does not exist - 
i.e. it's no different from the "keyboard interface" used for ordinary 
text.  and nameprep is still needed for many languages for which
the input environments don't need a special keyboard interface to
allow users to type in DNS names.

thus, we don't have the luxury of isolating nameprep with the keyboard
interface.  most of the programs that accept entry of DNS names will
do so using the normal text interface, which doesn't do any kind of 
nameprep. and in many cases (email messages, zone files, etc.) IDNs will 
be mixed with normal text.  so they have to separate IDNs from other 
text and perform nameprep (and perhaps ACE) on those IDNs.

thus I don't think the approach you listed as #1 is feasible.

Keith