From: "Sammy Mitchell" 
>This is weird. Now I'm answering my own Email :)
That is strange .
>Question: Is there a better way than forcing invalid keys to  ??
Setting it to -1 is probably the best.  For instance, that is what we do in
the CUAMark macro, so you can be pretty sure this will also work in the
future!
Sammy
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