diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
index e4844dd62077c..dcdd7f3acc904 100644
--- a/UPGRADE-3.1.md
+++ b/UPGRADE-3.1.md
@@ -15,6 +15,9 @@ Form
* The `choices_as_values` option of the `ChoiceType` has been deprecated and
will be removed in Symfony 4.0.
+ * Support for data objects that implements both `\Traversable` and `\ArrayAccess`
+ in `ResizeFormListener::preSubmit` method has been deprecated and will be
+ removed in Symfony 4.0.
HttpKernel
----------
diff --git a/UPGRADE-4.0.md b/UPGRADE-4.0.md
index a485e69023766..69a7d9a0ff51b 100644
--- a/UPGRADE-4.0.md
+++ b/UPGRADE-4.0.md
@@ -13,6 +13,8 @@ Form
----
* The `choices_as_values` option of the `ChoiceType` has been removed.
+ * Support for data objects that implements both `\Traversable` and
+ `\ArrayAccess` in `ResizeFormListener::preSubmit` method has been removed
Serializer
----------
diff --git a/src/Symfony/Component/Form/CHANGELOG.md b/src/Symfony/Component/Form/CHANGELOG.md
index 3671caab0898a..b82f644e31cdd 100644
--- a/src/Symfony/Component/Form/CHANGELOG.md
+++ b/src/Symfony/Component/Form/CHANGELOG.md
@@ -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
-----
diff --git a/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php b/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
index 197f556308f25..cd00cf368e8cc 100644
--- a/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
+++ b/src/Symfony/Component/Form/Extension/Core/EventListener/ResizeFormListener.php
@@ -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 (null === $data || '' === $data) {
$data = array();
}
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