fixed an issue with message source and model as params

framework/yii/i18n/I18N.php

@@ -8,6 +8,7 @@
 namespace yii\i18n;
 
 use Yii;
+use yii\base\Arrayable;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
 
@@ -94,7 +95,11 @@ class I18N extends Component
 	 */
 	public function format($message, $params, $language)
 	{
+		if ($params instanceof Arrayable) {
+			$params = $params->toArray();
+		} else {
 			$params = (array)$params;
+		}
 		if ($params === []) {
 			return $message;
 		}