fix(reactivity): fix error when using Proxy on reactive arrays

packages/reactivity/__tests__/reactiveArray.spec.ts

@@ -142,6 +142,23 @@ describe('reactivity/reactive/Array', () => {
     expect(length).toBe('01')
   })
 
+  // #9742
+  test('Array can be proxied', () => {
+    const array = reactive<number[]>([])
+    const proxy = new Proxy(array, {})
+    proxy.push(1)
+    expect(array).toHaveLength(1)
+    expect(proxy).toHaveLength(1)
+  })
+
+  test('toRaw on array using reactive as prototype', () => {
+    const original = reactive([])
+    const obj = Object.create(original)
+    const raw = toRaw(obj)
+    expect(raw).toBe(obj)
+    expect(raw).not.toBe(toRaw(original))
+  })
+
   describe('Array methods w/ refs', () => {
     let original: any[]
     beforeEach(() => {

packages/reactivity/src/baseHandlers.ts

@@ -116,6 +116,11 @@ class BaseReactiveHandler implements ProxyHandler<Target> {
     }
 
     const targetIsArray = isArray(target)
+    // #9742 if the target is array prevent and we retriving the RAW, retrieve the correct target
+    // if receiver is not an array is probably based on prototype.
+    if (key === ReactiveFlags.RAW && targetIsArray && isArray(receiver)) {
+      return target
+    }
 
     if (!isReadonly) {
       if (targetIsArray && hasOwn(arrayInstrumentations, key)) {