Returns a spec that validates fixed precision integers in the
range from start (inclusive) to end (exclusive).
Source
(defmacroint-in"Returns a spec that validates fixed precision integers in the
range from start (inclusive) to end (exclusive)."[startend]
`(spec (and int? #(int-in-range? ~start ~end %))
:gen #(gen/large-integer* {:min ~start :max (dec ~end)})))