Can we add (something like) the following simple utility functions for base64 encoding/decoding ?
(defn bytes->b64str (link: bytes)
  (String. (encode bytes)))
(defn str->b64str (link: s)
  (bytes->b64str (.getBytes s)))
(defn b64str->bytes (link: b64-str) 
  (decode (.getBytes b64-str)))
(defn b64str->str (link: b64-str) 
  (String. (b64str->bytes b64-str)))