docs: private static void appendRange(
          StringBuilder sb, DoubleTuple tuple, 
          Locale locale, String format, int min, int max)
      {
          for (int i=min; i<max; i++)
          {
              if (i > min)
              {
                  sb.append(", ");
              }
              if (locale != null && format != null)
              {
                  sb.append(String.format(locale, format, tuple.get(i)));
              }
              else
              {
                  sb.append(String.valueOf(tuple.get(i)));
              }
          }
      }