symfony
diff --git a/‎CHANGELOG.md
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+2Lines changed: 2 additions & 0 deletions b/‎CHANGELOG.md
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+2Lines changed: 2 additions & 0 deletions
diff --git a/‎Extension/Core/EventListener/ResizeFormListener.php
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+4Lines changed: 4 additions & 0 deletions b/‎Extension/Core/EventListener/ResizeFormListener.php
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+4Lines changed: 4 additions & 0 deletions
@@ -5,6 +5,8 @@ CHANGELOG
 -----
 
  * deprecated the "choices_as_values" option of ChoiceType
+ * deprecated support for data objects that implements both `Traversable` and
+   `ArrayAccess` in `ResizeFormListener::preSubmit` method
 
 3.0.0
 -----
 
@@ -102,6 +102,10 @@ public function preSubmit(FormEvent $event)
         $form = $event->getForm();
         $data = $event->getData();
 
+        if ($data instanceof \Traversable && $data instanceof \ArrayAccess) {
+            @trigger_error('Support for objects implementing both \Traversable and \ArrayAccess is deprecated since version 3.1 and will be removed in 4.0. Use an array instead.', E_USER_DEPRECATED);
+        }
+
         if (!is_array($data) && !($data instanceof \Traversable && $data instanceof \ArrayAccess)) {
             $data = array();
         }