title: How to index a slice element?
body: <p>I have a slice: <code>Keys []* datastore.Key</code></p>
  
  <p>How could I index one of them in the template file? I guessed <code>{{.Keys[3] }}</code>, but that doesn't work and I searched a lot but with no clue.</p>
  
  <p>Any suggestions would be welcome, thanks.</p>