I feel obligated to take this one step further - these folks are forgetting that "P" stands for "private". Their use of this space is their own problem, in all senses. It does not seem reasonable to me that *any* standard behavior could be expected of PUA code points, from operating systems or applications, as such may have chosen to, or may yet choose to, use those code points to encapsulate very un-font-rendering-like behavior, and such a decision, made past, present or future, is a perfectly valid private use.
Which I assume means: "it's wrong for Unicode to make ANY property pronouncements for ANY PUA characters, since that defines them, and removes the P from the Use."
-- Michael Everson * * Everson Typography * * http://www.evertype.com
