Vue路由器：重定向不适用于历史记录模式

Question

由于某种原因，常规重定向规则不适用于历史记录模式，但适用于哈希模式。

以下是代码段：

let first = {
  name: "first",
  template: `<section><h1>First</h1></section>`
};


let second = {
  name: "second",
  template: `<section><h2>Second</h2></section>`
};

new Vue({
  el: "#app",
  router: new VueRouter(
    {
      mode: "history", 
      routes: [
        { path: "/",  redirect: { name: 'first' }}, // Works with hash mode, but does't with history
        { path: "/first",  component: first,  name: "first"},
        { path: "/second", component: second, name: "second" }
      ]
    }
  )
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.10/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue-router/3.1.3/vue-router.min.js"></script>
<div id="app">
  <router-link to="/first">First</router-link>
  <router-link to="/second">Second</router-link>
  <router-view></router-view>
</div>

为什么？