/**
     * @param flags Flags.
     * @return String builder containing all flags.
     */
    static String toString(short flags) {
      SB sb = new SB();

      for (Mask m : MASKS) {
        if (m.ordinal() != 0) sb.a('|');

        sb.a(m.name().toLowerCase()).a('=').a(m.bit(flags));
      }

      return sb.toString();
    }