docs: public static byte[] encodeMultiple(final byte[] input) {
  
          if (input == null) {
              throw new NullPointerException("input");
          }
  
          final byte[] output = new byte[input.length << 1]; // * 2
  
          encodeMultiple(input, 0, output, 0, input.length);
  
          return output;
      }