I've added validation to a form and found that in some cases it is losing the invalid data I am feeding it and saving 0s instead. The output at the bottom shows that if I post the latitude as 'zzzzzz' (clearly not a number nor between -90 and 90) the form is declared as valid and saved with the value 0 How can that happen given that I have declared the input must be a number?

ProxyType.php buildForm()

$builder
        ->add('siteName', null, array('label' => 'Site name'))
        ....
        ->add('latitude', 'number', array('label' => 'Latitude'))
        ->add('longitude', 'number', array('label' => 'Longitude'))
        ....
    ;

ProxyController.php createAction

    ....
    $postData = $request->request->get('niwa_pictbundle_proxytype');
    $this->get('logger')->info('Posted latitude = '.$postData['latitude']);

    $form    = $this->createForm(new ProxyType(), $entity);
    $form->bindRequest($request);

    if ($form->isValid()) {
        $this->get('logger')->info('Form declared valid : latlong ('.$entity->getLatitude().','.$entity->getLongitude().')');
        ....

validation.yml

Acme\PictBundle\Entity\Proxy:
properties: 
    longitude:
        - Min: { limit: -180 }
        - Max: { limit: 180 }
    latitude:
        - Max: { limit: 90 }
        - Min: { limit: -90 }

Output

[2012-09-28 02:05:30] app.INFO: Posted latitude = zzzzzz [] []
[2012-09-28 02:05:30] app.INFO: Form declared valid : latlong (0,0) [] []