Changes for clojure.core/merge-with

zkim on Sun, 26 Sep 2010
;; merge two maps using the addition function

user=> (merge-with + 
                   {:a 1  :b 2}
                   {:a 9  :b 98 :c 0})
    
{:c 0, :a 10, :b 100}
fogus on Tue, 13 Jul 2010
*merge two maps using the addition function*

    (merge-with + 
                {:a 1  :b 2}
                {:a 9  :b 98 :c 0})
    
    ;=> {:c 0, :a 10, :b 100}