title: JSON stringify with AngularJS on the fly transformation
body: <p>Why can I not use something like this?</p>
  
  <pre><code>&lt;input type="text" ng-model="testVal"&gt;
  &lt;pre&gt;{{JSON.stringify(testVal,null,4)}}&lt;/pre&gt;
  </code></pre>
  
  <p>If I remove the JSON.stringify() method my code works just fine.</p>