message: fix: do not use MutationObserver in IE11
  MutationObserver is unreliable in IE11. fix
diff: @@ -99,13 +99,13 @@ export const nextTick = (function () {
  // "force" the microtask queue to be flushed by adding an empty timer.
  if (isIOS) setTimeout(noop)
  }
  - } else if (typeof MutationObserver !== 'undefined' && (
  + } else if (!isIE && typeof MutationObserver !== 'undefined' && (
  isNative(MutationObserver) ||
  // PhantomJS and iOS 7.x
  MutationObserver.toString() === '[object MutationObserverConstructor]'
  )) {
  // use MutationObserver where native Promise is not available,
  - // e.g. PhantomJS IE11, iOS7, Android 4.4
  + // e.g. PhantomJS, iOS7, Android 4.4
  var counter = 1
  var observer = new MutationObserver(nextTickHandler)
  var textNode = document.createTextNode(String(counter))
  