docs: private void processOptionField(Field field, String key, char shortKey) {
      String name = field.getName();
      Class<?> type = field.getType();
  
      if (key.equals("")) {
        key = name;
      }
  
      if (shortKey == '\0') {
        shortKey = key.charAt(0);
      }
  
      Command<? super T> option = createOption(name, type);
      addOption(key, shortKey, option);
    }