fix(reactivity): ensure that shallow and normal proxies are tracked seperately (close #2843) (#2851)

fix #2843

packages/reactivity/__tests__/shallowReactive.spec.ts

@@ -1,4 +1,5 @@
-import { shallowReactive, isReactive, reactive } from '../src/reactive'
+import { isReactive, reactive, shallowReactive } from '../src/reactive'
+
 import { effect } from '../src/effect'
 
 describe('shallowReactive', () => {
@@ -13,6 +14,16 @@ describe('shallowReactive', () => {
     expect(isReactive(props.n)).toBe(true)
   })
 
+  // #2843
+  test('should allow shallow und normal reactive for same target', async () => {
+    const original = { foo: {} }
+    const shallowProxy = shallowReactive(original)
+    const reactiveProxy = reactive(original)
+    expect(shallowProxy).not.toBe(reactiveProxy)
+    expect(isReactive(shallowProxy.foo)).toBe(false)
+    expect(isReactive(reactiveProxy.foo)).toBe(true)
+  })
+
   describe('collections', () => {
     test('should be reactive', () => {
       const shallowSet = shallowReactive(new Set())