protected function buildFormOptions()
 {
     $options = parent::buildFormOptions();
     if (isset($options['constraints'])) {
         $options['file_options'] = array_merge(isset($options['file_options']) ? $options['file_options'] : array(), array('constraints' => $options['constraints']));
         unset($options['constraints']);
     }
     return $options;
 }
 protected function buildFormOptions()
 {
     $options = parent::buildFormOptions();
     $options = array_merge(array('precision' => 4), $options);
     return $options;
 }