added note about traversable objects

schmittjoh · schmittjoh · commit b8d0072bac71 · 2012-10-17T13:54:25.000+03:00
diff --git a/UPGRADING.md b/UPGRADING.md
@@ -14,6 +14,18 @@ Upgrading From 0.9 to 1.0
 
     Please see the documentation for how to set-up one of these.
 
+- Objects implementing Traversable
+
+    Objects that implement the Traversable interface are not automatically treated specially
+    anymore, but are serialized just like any regular object. If you would like to restore the
+    previous behavior, you can either add a custom handler, or force the serialization type 
+    to ``array`` using the ``@Type`` annotation (or its equivalent in XML/YML):
+
+    ```
+    /** @Type("array") */
+    private $myTraversableObject;
+    ```
+
 - Configuration
 
     Most of the configuration under ``jms_serializer.handlers`` is gone. The order is not
