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On Tue, 12 Feb 2002 wrote:

> [...] suppose I'm writing a library which
> defines a predicate function P. What value should P return if the predicate
> is not true, false or nil?

That depends on the kind of logic you are using. If we can assume that
not true is false (an old-style, outdated 2-value logic??) then any
predicate should return only true/false.

-- Roberto