parentData parameter to [re]fillTemplate doesn't seem to be working

[rnikander]

I'm just starting to use this, so maybe I'm missing something. I tried a small example...

<script src="jquery-1.10.2.js" type="text/javascript"></script>
<script src="js-template.js" type="text/javascript"></script>
...
<div id='template1'>
     <h1 data-jst-content='title'>Title</h1>
     <div>Extra: <span data-jst-content='foo'>...</span>       
     </div>
</div>

var favorites = {
  title: "Favorites",
  favs: ["apple", "banana", "orange"]
};

var extra = {
  foo: 'foo extra'
};

$(document).ready(function () {
    $('#template1').refillTemplate(favorites, extra);
});

Nothing is showing up after Extra: