title: Polymer 1.0 access parent e.model in nested repeats
body: <pre><code>&lt;template is="dom-repeat" items="{{items}}" as="first"&gt;
      &lt;template is="dom-repeat" items="{{first}}" as="second"&gt;
          &lt;span on-tap="test"&gt;{{second}}&lt;/span&gt;
      &lt;/template&gt;
  &lt;/template&gt;
  
  items: [["1","2"],["3","4"]],
  test: function (e) {
      // access e.model of first
  }
  </code></pre>
  
  <p>Is it possible to access the e.model of the outer repeat loop? Just getting the object is not enough (altough this would be a start). I need the model variable to use push/pop on it. To my surprise e.model.first does not exist.</p>