code: function UserAgent(userAgent, // @arg String = navigator.userAgent
                     options) { // @arg Object = {} - { WEB_VIEW, DISPLAY_DPR, DISPLAY_LONG, DISPLAY_SHORT }
      if (UserAgent["DISABLE_CACHE"]) {
          return UserAgent_parse(userAgent, options || {});
      }
      if (!UserAgent["cache"]) {
          UserAgent["cache"] = UserAgent_parse(userAgent, options || {});
      }
      return UserAgent["cache"];
  }
docs: --- class / interfaces ----------------------------------