From 05b6ce448f788d26866862187e1a6c81f8ee5fd9 Mon Sep 17 00:00:00 2001
From: Enzo Santamaria <62953579+Enz000@users.noreply.github.com>
Date: Tue, 16 Jan 2024 14:32:24 +0100
Subject: [PATCH] add note in DiscriminatorMap section

---
 components/serializer.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/serializer.rst b/components/serializer.rst
index a1a281f63c8..a58bdf1fd85 100644
--- a/components/serializer.rst
+++ b/components/serializer.rst
@@ -1837,6 +1837,11 @@ and ``BitBucketCodeRepository`` classes:
             </class>
         </serializer>
 
+.. note::
+
+    The values of the array parameter `mapping` should be strings.
+    Otherwise, it will implicitly be cast into strings.
+
 Once configured, the serializer uses the mapping to pick the correct class::
 
     $serialized = $serializer->serialize(new GitHubCodeRepository(), 'json');