numberp
object => generalized-boolean
object---an object.
generalized-boolean---a generalized boolean.
Returns true if object is of type number; otherwise, returns false.
(numberp 12) => true (numberp (expt 2 130)) => true (numberp #c(5/3 7.2)) => true (numberp nil) => false (numberp (cons 1 2)) => false
(numberp object) == (typep object 'number)
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