From 075cbcf1c6ce7d9b77ab45b39794a53689764f74 Mon Sep 17 00:00:00 2001
From: Julian Vanden Broeck <julian.vandenbroeck@dalibo.com>
Date: Wed, 30 Jul 2025 15:57:07 +0200
Subject: [PATCH] Match return type of SerializationInfo.mode() to mode of
 model_dump()

Pydantic sometimes uses Literal['python', 'json'] | str for the
serialization mode. Using a more restrictive type can cause issues
(e.g., typing validation errors).

This commit adjusts the return type to align with other valid
Pydantic serialization modes and prevent such issues.

This can be seen as a follow-up to commit:
9b239c174b316de092a9692d67723427ee0c24f7
---
 python/pydantic_core/core_schema.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/pydantic_core/core_schema.py b/python/pydantic_core/core_schema.py
index d03dded87..957ec85da 100644
--- a/python/pydantic_core/core_schema.py
+++ b/python/pydantic_core/core_schema.py
@@ -145,7 +145,7 @@ def context(self) -> ContextT:
         ...
 
     @property
-    def mode(self) -> Literal['python', 'json']:
+    def mode(self) -> Literal['python', 'json'] | str:
         """The serialization mode set during serialization."""
         ...