dynamic varsince v0.0-3255 clojure.pprint/*print-radix*Edit
Source docstring:
Print a radix specifier in front of integers and rationals. If *print-base* is 2, 8,
or 16, then the radix specifier used is #b, #o, or #x, respectively. Otherwise the
radix specifier is in the form #XXr where XX is the decimal value of *print-base* 
Source code @ clojurescript:src/main/cljs/cljs/pprint.cljs
(def ^{:added "1.2", :dynamic true} *print-radix* nil)