title: Iterate over arrays in liquid templates
body: <p>I know I can iterate over arrays in liquid template with this code:</p>
  
  <pre><code>{% for item in myarray %}
      &lt;p&gt;{{ item.label }}&lt;/p&gt;
  </code></pre>
  
  <p>But how can I get the index of my item within the array?</p>