Clojure's vars can thread-locally, temporarily be re-bound, see http://clojure.org/vars http://clojure.org/vars and http://clojure.org/api#binding http://clo

Clojure's vars can thread-locally, temporarily be re-bound, see http://clojure.org/vars http://clojure.org/vars and http://clojure.org/api#binding http://clojure.org/api#binding