Changes for clojure.core/nil?

jafingerhut on Wed, 28 Mar 2012
user=> (nil? nil)
true
user=> (nil? 0)
false
user=> (nil? false)
false
dpritchett on Tue, 13 Jul 2010
user=> (nil? nil)
true
user=> (nil? 0)
false
user=> (nil? false)
false