Changes for clojure.core/mapcat

zkim on Sun, 26 Sep 2010
user=> (mapcat reverse [[3 2 1 0] [6 5 4] [9 8 7]])
(0 1 2 3 4 5 6 7 8 9)
nipra on Tue, 13 Jul 2010
user> (mapcat reverse [[3 2 1 0] [6 5 4] [9 8 7]])
(0 1 2 3 4 5 6 7 8 9)
user>