title: How to use dom-repeat with objects instead of arrays in Polymer 1.0?
body: <p>Iterating over an array <code>myarray=[1, 2, 3]</code> works like this:</p>
  
  <pre><code>&lt;template is="dom-repeat" items="[[myarray]]"&gt;
      &lt;span&gt;[[item]]&lt;/span&gt;
  &lt;/template&gt;
  </code></pre>
  
  <p>How can I iterate over an object <code>myobject = {a:1, b:2, c:3}</code>?</p>