From fc4e5c27fa0f37f42420ae24300ad0b3d6c1a77b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20Vo=C5=99=C3=AD=C5=A1ek?= <mvorisek@mvorisek.cz>
Date: Wed, 27 Jan 2021 20:26:06 +0100
Subject: [PATCH] Add nullable to return type for Serializable::serialize

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Closes GH-423.
---
 language/predefined/serializable/serialize.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/language/predefined/serializable/serialize.xml b/language/predefined/serializable/serialize.xml
index 9c51725402..57ad161eee 100644
--- a/language/predefined/serializable/serialize.xml
+++ b/language/predefined/serializable/serialize.xml
@@ -10,7 +10,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <modifier>abstract</modifier> <modifier>public</modifier> <type>string</type><methodname>Serializable::serialize</methodname>
+   <modifier>abstract</modifier> <modifier>public</modifier> <type class="union"><type>string</type><type>null</type></type><methodname>Serializable::serialize</methodname>
    <void />
   </methodsynopsis>
   <para>