使用数组语法时未将验证器添加到链中

在我的 Zend Framework 2 Form 类中，我像这样添加我的元素：

    $this->add(array(
        'name' => 'passwordConfirm',
        'type' => 'Password',
        'attributes' => array(
            'required' => 'required',
            'placeholder' => 'Confirm password',
        ),
        'options' => array(
            'label' => 'Confirm password',
            'column-size' => 'sm-10',
            'label_attributes' => array(
                'class' => 'col-sm-2',
            ),
        ),
        'validators' => array(
            array(
                'name' => 'NotEmpty',
            ),
            array(
                'name' => 'Identical',
                'options' => array(
                    'token' => 'password',
                ),
            ),
        ),
    ));

正如官方参考中所述。我创建表单的新实例，如下所示：

    $form = $this->getServiceLocator()->get('user.auth.form');
    $hydrator = new DoctrineHydrator($this->entityManager());
    $form->setHydrator($hydrator);
    $form->bind($user);

但是，validators不会添加到元素验证器链中。这是var_dump($form->get('passwordConfirm'));的输出

object(Zend'InputFilter'Input)[506]
  protected 'allowEmpty' => boolean true
  protected 'continueIfEmpty' => boolean false
  protected 'breakOnFailure' => boolean false
  protected 'errorMessage' => null
  protected 'filterChain' => 
    object(Zend'Filter'FilterChain)[507]
       protected 'plugins' => null
       protected 'filters' => 
        object(Zend'Stdlib'PriorityQueue)[508]
          protected 'queueClass' => string 'Zend'Stdlib'SplPriorityQueue' (length=28)
          protected 'items' => 
            array (size=0)
              ...
          protected 'queue' => null
      protected 'options' => 
         array (size=0)
           empty
   protected 'name' => string 'passwordConfirm' (length=15)
   protected 'notEmptyValidator' => boolean false
   protected 'required' => boolean false
   protected 'validatorChain' => 
     object(Zend'Validator'ValidatorChain)[509]
      protected 'plugins' => null
      protected 'validators' => 
        array (size=0)
          empty
      protected 'messages' => 
        array (size=0)
          empty
  protected 'value' => null
  protected 'fallbackValue' => null
  protected 'hasFallback' => boolean false

当我为验证器输入无效输入时，$form->isValid()可以毫无问题地接受表单。

我做错了什么？