ng-repeat filter on boolean

filter by obj expression:

<h3>Unregistered Users</h3>
<div ng-repeat="user in users | filter:{registered:false}">
    <div class="row-fluid">
    <div class="span2">
      {{user.name}}
    </div>
  </div>
</div>

JSFiddle: http://jsfiddle.net/alfrescian/9ytDN/