title: Aurelia repeat.for access index of item
body: <p>I have a simple repeat.for:</p>
  
  <pre><code>&lt;li repeat.for="item of items"&gt;${item}&lt;/li&gt;
  </code></pre>
  
  <p>Currently I'm using: <code>${$parent.items.indexOf(item)}</code>.
  Is there a shorthand, something like {{$index}} in angular?</p>