RE: [idn] stringprep comment 1

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

At 2:26 PM -0800 2/1/02, Yves Arrouye wrote:
>  > Client A sends out a character that will never match something that
>>  could be stored in a name server under -07 (because it is unassigned)
>>  or under -08 or later (because it is mapped to nothing). Why would
>>  you expect the server to ever match it? What is the problem here that
>>  you see and that I don't?
>
>No I don't expect the server to match it, since it is deleted. All I am
>saying is that the assumption that has been stated here many times that "an
>application that uses a former version of Nameprep to speak to a server
>using a later one has nothing to worry about because it just passes all
>unassigned codepoints (from its former Nameprep perspective) to the server"
>is not true. If that assumption is old / has been revised then I am just
>wasting your bandwidth :)

I think so. :-) "Nothing to worry about" means "the server won't 
falsely give a positive result when it should have been negative". 
You should worry if the protocol had a state where the client was 
asking for something that would never exist but the server could 
mistakenly give a positive answer.

--Paul Hoffman, Director
--Internet Mail Consortium