Adopting ZWJ

[Karl Williamson]

I heard that someone was considering adopting ZWJ.  They seemed to think 
that non-printables are not adoptable.  But I was unable to find a clear 
list of criteria.  The page that allows one to adopt said that it wasn't 
available, but that page really doesn't make it clear how one can test 
for this without actually doing the adoption.  (Since it doesn't 
actually ask for your credit card number on the initial page, one can 
back out before the final commitment, but that's not a very friendly 
interface)