docs: public static void acceptsHex(OptionParser parser) {
          parser.acceptsAll(Arrays.asList(OPT_X, OPT_HEX), "fetch key/entry by key value of hex type")
                .withRequiredArg()
                .describedAs("key-list")
                .withValuesSeparatedBy(',')
                .ofType(String.class);
      }