From 595d81392029e717155ff160f788e0f0a13be99e Mon Sep 17 00:00:00 2001
From: Marcel Hellkamp <marc@gsites.de>
Date: Wed, 28 Aug 2024 16:09:43 +0200
Subject: [PATCH] fix: Make `ConfigDict.setdefault` API match `dict`

---
 bottle.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bottle.py b/bottle.py
index 8191bcf5..b087dd48 100755
--- a/bottle.py
+++ b/bottle.py
@@ -2441,7 +2441,7 @@ def update(self, *a, **ka):
         for key, value in dict(*a, **ka).items():
             self[prefix + key] = value
 
-    def setdefault(self, key, value):
+    def setdefault(self, key, value=None):
         if key not in self:
             self[key] = value
         return self[key]