From b0ab6186ef20ef16d97d9a2f8771417b08ea27f3 Mon Sep 17 00:00:00 2001
From: jack1142 <6032823+jack1142@users.noreply.github.com>
Date: Sun, 20 Feb 2022 21:49:39 +0100
Subject: [PATCH] Ensure that registered Config defaults are serializable to
 JSON (#5557)

---
 redbot/core/config.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/redbot/core/config.py b/redbot/core/config.py
index 6db8af5ba..f1ada22d7 100644
--- a/redbot/core/config.py
+++ b/redbot/core/config.py
@@ -1,5 +1,6 @@
 import asyncio
 import collections.abc
+import json
 import logging
 import pickle
 import weakref
@@ -807,7 +808,8 @@ class Config(metaclass=ConfigMeta):
         if key not in self._defaults:
             self._defaults[key] = {}
 
-        data = pickle.loads(pickle.dumps(kwargs, -1))
+        # this serves as a 'deep copy' and verification that the default is serializable to JSON
+        data = json.loads(json.dumps(kwargs))
 
         for k, v in data.items():
             to_add = self._get_defaults_dict(k, v)