fix(reactivity): Array methods relying on identity should work with raw values

packages/reactivity/__tests__/reactive.spec.ts

@@ -44,6 +44,27 @@ describe('reactivity/reactive', () => {
     expect(clone[0]).toBe(observed[0])
   })
 
+  test('Array identity methods should work with raw values', () => {
+    const raw = {}
+    const arr = reactive([{}, {}])
+    arr.push(raw)
+    expect(arr.indexOf(raw)).toBe(2)
+    expect(arr.indexOf(raw, 3)).toBe(-1)
+    expect(arr.includes(raw)).toBe(true)
+    expect(arr.includes(raw, 3)).toBe(false)
+    expect(arr.lastIndexOf(raw)).toBe(2)
+    expect(arr.lastIndexOf(raw, 1)).toBe(-1)
+
+    // should work also for the observed version
+    const observed = arr[2]
+    expect(arr.indexOf(observed)).toBe(2)
+    expect(arr.indexOf(observed, 3)).toBe(-1)
+    expect(arr.includes(observed)).toBe(true)
+    expect(arr.includes(observed, 3)).toBe(false)
+    expect(arr.lastIndexOf(observed)).toBe(2)
+    expect(arr.lastIndexOf(observed, 1)).toBe(-1)
+  })
+
   test('nested reactives', () => {
     const original = {
       nested: {