Recreature and reattache custom elements depending on state property' value

test-app.html

<dom-module id="test-app">
  <style>
    :host {
      display: block;
    }
  </style>
  <template>
    ...
    <template is="dom-if" if="{{isState(state, 'home')}}" restamp="true">
      <feed-view count="{{count}}"></feed-view>
    </template>
    ...
  </template>
</dom-module>
<script>
  Polymer({
    is: 'test-app',
    properties: {
      state: {
        type: String,
        value: 'home'
      },
      count: {
        type: Number,
        value: 5
      },
    },
    isState: function(state, value) {
      return state === value;
    },
  });
</script>