anchor.diff:      return isMaster;
     }
   
  -  static bool filterIsMaster(HttpContext ctx) {
  +  static bool _filterIsMaster(HttpContext ctx) {
       bool isUserMaster = isMaster(ctx);
   
       if(!isUserMaster) {
  
positive.code:   }
  
    static void handleLogout(HttpContext ctx) {
      if (!filterIsMaster(ctx)) {
        return;
      }
      _removeSessionToken(ctx)
  
negative.code:   }
  
    static handleUpload(HttpContext ctx) {
      if (!_filterIsMaster(ctx)) {
        return;
      }
      PinLogger.instance.fine('[CartAction] handleUpload: Start to handle file upload action.');
  