vue3 のプロキシに Reflect を使用する必要があるのはなぜですか?

const tempObj = { a: 1 };
Reflect.get(tempObj, 'a'); // 返回 1
Reflect.set(tempObj, 'a', 2); // 返回true 表示设置成功， a的值变2

const tempObj1 = { a: 1 };
const handler = {
  get: function (obj, prop, receiver) {
    return prop === 'a' ? 1000 : obj[prop];
  },
  set: function (obj, prop, value, receiver) {
    console.log(prop);
    obj[prop] = prop === 'a' ? 6 : value;
    return true;
  },
};
const proxyObj = new Proxy(tempObj1, handler);
proxyObj.a; // proxyObj => {a: 1000}
proxyObj.a = 2; // proxyObj => {a: 6}

const tempObj1 = { a: 1 };
const handler = {
  get: function (obj, prop, receiver) {
    return obj[prop];
  },
  set: function (obj, prop, value, receiver) {
    obj[prop] = value
    return true;
  },
};
const proxyObj = new Proxy(tempObj1, handler);
proxyObj.a; // proxyObj => {a: 1}
proxyObj.a = 2; // proxyObj => {a: 2}

const tempObj1 = {
  a: 1,
  get value() {
    console.log(this === proxyObj); // false
    return this.a;
  },
};
const handler = {
  get: function (obj, prop, receiver) {
    return obj[prop];
  },
  set: function (obj, prop, value, receiver) {
    obj[prop] = value;
    return true;
  },
};
const proxyObj = new Proxy(tempObj1, handler);
proxyObj.value; // 1

const parent = {
  a: 1,
  get value() {
    console.log(this === child); // false
    return this.a;
  },
};
const handler = {
  get: function (obj, prop, receiver) {
    return obj[prop];
  },
  set: function (obj, prop, value, receiver) {
    obj[prop] = value;
    return true;
  },
};

const proxyObj = new Proxy(parent, handler);
const child = Object.setPrototypeOf({ a: 2 }, proxyObj);
child.value; // 1

const parent = {
  a: 1,
  get value() {
    console.log(this === child); // true
    return this.a;
  },
};
const handler = {
  get: function (obj, prop, receiver) {
    Reflect.get(obj, prop)
   - return obj[prop];
   + retrun Reflect.get(obj, prop, receiver)
  },
  set: function (obj, prop, value, receiver) {
   - obj[prop] = value;
   + Reflect.get(obj, prop, value, receiver)
    return true;
  },
};

const proxyObj = new Proxy(parent, handler);
const child = Object.setPrototypeOf({ a: 2 }, proxyObj);
child.value; // 2

  get: function (...arg) {
    return Reflect.get(...arg);
  },