(= 1)
(= null)
(= [1 2])
(= (fn []))
(= 1 1)
(= 1 2)
(= 1 1 1)
(= 1 1 2)
(= 1 2 1)
(= 1 2 "2")
(= 1 1 2 null)
(= null null null)
(= [1] [1] [1])