On Aug 23, 2022, at 5:52 PM, John Levine <jo...@taugh.com> wrote:
> 
> It appears that Paul Hoffman  <paul.hoff...@icann.org> said:
>>>> This document uses ".alt" for the pseudo-TLD in the presentation
>>>>     format for the DNS, corresponding to a 0x03616c7400 suffix in DNS
>>>>     wire format.  The presentation and on-the-wire formats for non-DNS
>>>>     protocols might be different.
>>>> "
>>>> 
>>>> I had to read this 3 times and I am still not sure what is important and 
>>>> what not.
>>> 
>>> Doesn't this text also imply that the alt label is case-sensitive?
>> 
>> <sigh> Yes. We have at least three options:
>> 
>> 1) Pick one capitalization of "alt" and use the binary representation of 
>> that; for example "alt".
>> 
>> 2) Pick two capitalizations of "alt" and use the binary representations of 
>> those; for example "alt" and "ALT".
>> 
>> 3) Use all nine possible representations ("alt", "Alt", "ALt", ... "ALT")
> 
> 4) Say in English prose that since the DNS ignores ASCII case
> distinctions, all versions of .alt are excluded from the DNS, but it's
> up to each non-DNS thing to choose which if any of the versions it
> uses and it how it interprets them.

That feels best to me.

--Paul Hoffman

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