From 7add29c77b088299841e1017a7cd2f96133a6659 Mon Sep 17 00:00:00 2001
From: David Lord <davidism@gmail.com>
Date: Tue, 8 Oct 2024 09:16:25 -0700
Subject: [PATCH] fix exact str check

---
 CHANGES.rst                | 1 +
 src/markupsafe/__init__.py | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 3c72a796..941fcd7c 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,7 @@ Version 3.0.1
 Unreleased
 
 -   Address compiler warnings that became errors in GCC 14. :issue:`466`
+-   Fix compatibility with proxy objects. :issue:`467`
 
 
 Version 3.0.0
diff --git a/src/markupsafe/__init__.py b/src/markupsafe/__init__.py
index 0afddc0c..fee8dc7a 100644
--- a/src/markupsafe/__init__.py
+++ b/src/markupsafe/__init__.py
@@ -34,7 +34,9 @@ def escape(s: t.Any, /) -> Markup:
     """
     # If the object is already a plain string, skip __html__ check and string
     # conversion. This is the most common use case.
-    if s.__class__ is str:
+    # Use type(s) instead of s.__class__ because a proxy object may be reporting
+    # the __class__ of the proxied value.
+    if type(s) is str:
         return Markup(_escape_inner(s))
 
     if hasattr(s, "__html__"):