Fixed missing JsonSerializable check

Author: mattjanssen

src/Serializer/Adapter/ArraySerializerAdapter.php

@@ -2,6 +2,7 @@
 
 namespace MattJanssen\ApiResponseBundle\Serializer\Adapter;
 
+use JsonSerializable;
 use MattJanssen\ApiResponseBundle\Serializer\ArraySerializable;
 
 /**
@@ -55,6 +56,10 @@ private function serializedMixed($data, array $groups = null)
                 return $this->serializedMixed($data->arraySerialize($groups), $groups);
             }
 
+            if ($data instanceof JsonSerializable) {
+                return $this->serializedMixed($data->jsonSerialize(), $groups);
+            }
+
             // A non-serializable object returns as an empty \stdClass object.
             // This gets converted to {} by json_encode, where as an empty array is converted to [].
             return new \stdClass();