docs: public String key(String keyName, boolean allowNull) {
  
          try {
              if (m_dictionary != null) {
                  return m_dictionary.get(keyName);
              }
          } catch (@SuppressWarnings("unused") MissingResourceException e) {
              // not found, return warning
              if (allowNull) {
                  return null;
              }
          }
          return formatUnknownKey(keyName);
      }