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Question: 为什么使用 defineProperty 之后，在修改对象属性之前输出对象，属性的值是修改之后的值

期望结果

在使用 defineProperty 之后，在修改对象属性之前输出该对象，该属性的值为修改之前的值

实际结果

实际输出的是修改之后的值，vue2 中也存在该现象，但是通过 Proxy 方法就可以正常输出修改之前的值，请问为什么会出现该现象

复现步骤

简单复现步骤
https://codepen.io/lullabies/pen/zYNXMvr

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