[R6RS] Predicate for "neither infinite nor NaN"

[Michael Sperber]

dyb at cs.indiana.edu writes:

>> The specification of arithmetic in a number of places refers to
>> numbers that can be anything except infinite or NaN.  Should we have a
>> predicate for this?  (Jaffer's SRFI has `finite?' for this purpose, I
>> believe.)
>
> Such a predicate might be nice.  The name finite? is okay with me.  We
> already have a nan? predicate, right?  Will we also have an infinite? 
> predicate, so that the predicates finite?, infinite?, and nan? are
> orthogonal and cover the space of all real numbers?

I've added those to the SRFI and the reference implementation.

-- 
Cheers =8-} Mike
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