> > when you get external connectivity and a global prefix and
> > realize that you're better off not having to support both the
> > global and the GUSL prefixes.   so you want to renumber from
> > GUSL to global.
> > 
> 
> No actually, I don't want to renumber from GUSL to global --
> I want both.

you want both.  others will want to renumber.
 
> > (e.g. your apps run more reliably, administration is simpler, etc.)
> 
> Ironically, that is exactly why I will keep site-locals running
> in parallel with my globals.

having SLs (even globally unique ones) in addition to globals 
causes its own pain.  

I am not arguing that you shouldn't be able to choose to have
your network that way, just that the architecture should make
it easy to move from one kind of prefix to another.  What would
bother me is an architecture that imposed more pain for a site
that had started out with a GUSL and needed to transition to
globals.
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