Clojure's tagged literals and `clojure.edn` namespace functions allow 
hyper-local (per call) specification of tagged-literal data readers during 
deserialization.  The letterpress library provides a similar capability for 
printing, allowing per-call specification of print methods and general 
recursive printing middleware.

Code and documentation on github:

    https://github.com/llasram/letterpress

Example, round-tripping a JVM Class object through EDN:

(require '[letterpress.core :as lp])

(defn class-print [^Class x ^Writer w]
  (doto w (.write "#java.lang/class ") (.write (.getName x))))
(defn class-read [x] (Class/forName (name x)))

(->> String
     (lp/pr-str {:printers {Class class-print}})
     (edn/read-string {:readers {'java.lang/class class-read}}))
;;=> java.lang.String
(class *1)
;;=> java.lang.Class


Comments and pull requests gladly accepted.

-Marshall

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