fix(reactivity): call array subclass methods (#3624)

fix #2314, close #2315

packages/reactivity/src/baseHandlers.ts

@@ -49,17 +49,16 @@ function createArrayInstrumentations() {
   // instrument identity-sensitive Array methods to account for possible reactive
   // values
   ;(['includes', 'indexOf', 'lastIndexOf'] as const).forEach(key => {
-    const method = Array.prototype[key] as any
     instrumentations[key] = function(this: unknown[], ...args: unknown[]) {
-      const arr = toRaw(this)
+      const arr = toRaw(this) as any
       for (let i = 0, l = this.length; i < l; i++) {
         track(arr, TrackOpTypes.GET, i + '')
       }
       // we run the method using the original args first (which may be reactive)
-      const res = method.apply(arr, args)
+      const res = arr[key](...args)
       if (res === -1 || res === false) {
         // if that didn't work, run it again using raw values.
-        return method.apply(arr, args.map(toRaw))
+        return arr[key](...args.map(toRaw))
       } else {
         return res
       }
@@ -68,10 +67,9 @@ function createArrayInstrumentations() {
   // instrument length-altering mutation methods to avoid length being tracked
   // which leads to infinite loops in some cases (#2137)
   ;(['push', 'pop', 'shift', 'unshift', 'splice'] as const).forEach(key => {
-    const method = Array.prototype[key] as any
     instrumentations[key] = function(this: unknown[], ...args: unknown[]) {
       pauseTracking()
-      const res = method.apply(this, args)
+      const res = (toRaw(this) as any)[key].apply(this, args)
       resetTracking()
       return res
     }