Re: length restrictions on IDN label

> That's true.  A cursory examination of the Punycode algorithm reveals
> that each ASCII character can represent at most one code point;
> therefore an internationalized label can represent at most 63 code
> points, whether it's ACE or not.  A given encoding uses a bounded number
> of octets per code point, so you can allocate your buffers based on
> that.

63 code points is presumably a conservative number. Given the 4 octet ACE 
prefix you can only fit a 59 octets worth of punycode output per label, hence
presumably 59 code points is a tighter limit for non-ASCII internationalized 
labels while 63 code points is the limit for ASCII labels.

  Erik