fix: Ensure that the order at desroy is the same as before change to …

…from (#1278)

src/index.js

@@ -14,6 +14,7 @@ import {
   isFunction,
   looseClone,
   remove,
+  arrayFrom,
   includes,
   merge,
   numberFormatKeys,
@@ -250,11 +251,13 @@ export default class VueI18n {
   watchI18nData (): Function {
     const self = this
     return this._vm.$watch('$data', () => {
-      self._dataListeners.forEach(e => {
+      const listeners = arrayFrom(this._dataListeners)
+      let i = listeners.length
+      while(i--) {
         Vue.nextTick(() => {
-          e && e.$forceUpdate()
+          listeners[i] && listeners[i].$forceUpdate()
         })
-      })
+      }
     }, { deep: true })
   }
 

src/util.js

@@ -108,6 +108,12 @@ export function remove (arr: Set<any>, item: any): Set<any> | void {
   }
 }
 
+export function arrayFrom (arr: Set<any>): Array<any> {
+  const ret = []
+  arr.forEach(a => ret.push(a))
+  return ret
+}
+
 export function includes (arr: Array<any>, item: any): boolean {
   return !!~arr.indexOf(item)
 }