code: public static StringBuilder format (StringBuilder into, Object... args) {
      for (int ii = 0, ll = args.length/2; ii < ll; ii++) {
        if (ii > 0) into.append(", ");
        into.append(args[2*ii]).append("=").append(args[2*ii+1]);
      }
      return into;
    }
docs: Formats the supplied key/value arguments into the supplied string builder as
  {@code key=value, key=value, ...}.
  @return the supplied string builder.