code: function notifyHandlers (stack, windowError) {
              var exception = null;
              if (windowError && !TraceKit.collectWindowErrors) {
                  return;
              }
              for (var i in handlers) {
                  if (_has(handlers, i)) {
                      try {
                          handlers[i].apply(null, [stack].concat(_slice.call(arguments, 2)));
                      } catch (inner) {
                          exception = inner;
                      }
                  }
              }
  
              if (exception) {
                  throw exception;
              }
          }
docs: Dispatch stack information to all handlers.
  @param {Object.<string, *>} stack