Has anyone done Logical values (that is true, false or unknown) in
Ruby? I see there is TrueClass (and only one instance of it; true)
and FalseClass (and only one instance of it; false), but I don't
see see UnknownClass (or only one instance of it; unknown).

Any ideas? Or implementations already?

-- 
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[   pub 1024/951AFAF5 1995/12/12   Juha Pohjalainen <jmp / iki.fi>   ]
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