(ratio? n)
Returns true if n is a Ratio
(ratio? 22/7)
;; => true
(ratio? 22)
;; => false
(ratio? 2.2)
;; => false
;; Both True
user=> (ratio? 22/7)
;; => true
user=> (rational? 22/7)
;; => true
;; Different
user=> (ratio? 22)
;; => false
user=> (rational? 22)
;; => true
;; Both False
user=> (ratio? 0.5)
;; => false
user=> (rational? 0.5)
;; => false