Hi Romano, et al

<< Mine is only an idea, i'm not sure this is the true reason, but a none
value
can be used directly in expression like:

 if ref [...]
 either ref [][]

An unset value would generate an error in these cases. >>

That's exactly what I was thinking. I have no clue about the inner workings,
but I can say, from my persepctive, that I wouldn't want to use unset? to
check for refinements. The current approach makes for very readable code
IMO.

--Gregg

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