title: FormData sends boolean as string to server
body: <p>I have the following input which is a toggle returns true , false</p>
  
  <pre><code>&lt;input id="{{event.id}}" ng-model="event.is_active" type="checkbox" value="true" class="block__input" ng-class="{'input__toggle--active' :  event.is_active}"&gt;
  </code></pre>
  
  <p>and when I send it like this</p>
  
  <pre><code> var formData = new FormData();
              console.log(scope.event.is_active);
              formData.append('is_active', scope.event.is_active);
  </code></pre>
  
  <p>In the server I receive false and true as strings 'true', 'false' </p>
  
  <p>How to solve this problem ?</p>