docs: public static String toBinaryString(byte[] b) {
      StringBuilder s = new StringBuilder();
      for (byte by : b) {
        for (int j = 7; j >= 0; j--) {
          if ((by & (1 << j)) > 0) {
            s.append('1');
          } else {
            s.append('0');
          }
        }
        s.append(' ');
      }
      return s.toString();
    }