title: How to sort array in ng-options by key?
body: <p>There is such array:</p>
  
  <pre><code>month: Array[13]0: "M"1: "January"2: "February"3: "March"4: "April"5: "May"6: "June"7: "July"8: "August"9: "September"10: "October"11: "November"12: "December"
  </code></pre>
  
  <p>I do:</p>
  
  <pre><code>ng-options="key as value for (key, value) in data.month | orderBy:key"
  </code></pre>
  
  <p>But I get unsorted select list. </p>