| dynamic var | since v0.0-927 | Edit | 
Not implemented. In clojure, it can be bound to true to preserve object types when printing, allowing successful object duplication when read back.
In Clojure, when *print-dup* is set to true, print functions will check for a
print-dup multimethod on any given object, rather than their usual print-method.
An object type can implement this differently if reading the normal string would
not faithfully duplicate the original object.
When set to logical true, objects will be printed in a way that preserves their type when read in later. Defaults to false.
(def
  ^{:dynamic true}
  *print-dup* false)