Cheshire encode-map bug.

gistfile1.clj

(ns cheshire-test ;;this is cheshire 5.1.0
  (:require [cheshire
             [core :as json]
             [generate :refer [add-encoder encode-map]]]))

(json/generate-string {:x (java.util.Date.)}) ;;works fine: {"x":"2013-04-12T19:05:54Z"}

;;I want to print out dates as {"#inst":"2013-04-12T19:05:54Z"}
(add-encoder java.util.Date
             (fn [date json-generator]
               (encode-map {"inst" (subs (pr-str date) 7 36)}
                           json-generator)))

(json/generate-string {:x (java.util.Date.)}) ;;BOOM! Wrong number of args (4) passed to: generate$generate