From 95b6fb6f2fe1bf854cf4e05418a5334db2930492 Mon Sep 17 00:00:00 2001
From: tcely <tcely@users.noreply.github.com>
Date: Tue, 1 Apr 2025 03:37:39 -0400
Subject: [PATCH] Flatten the keys list

```
>>> help( list.append )
Help on method_descriptor:

append(self, object, /)
    Append object to the end of the list.

>>> help( list.extend )
Help on method_descriptor:

extend(self, iterable, /)
    Extend list by appending elements from the iterable.
```
---
 yt_dlp/utils/_utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/yt_dlp/utils/_utils.py b/yt_dlp/utils/_utils.py
index 24525560e..07b614101 100644
--- a/yt_dlp/utils/_utils.py
+++ b/yt_dlp/utils/_utils.py
@@ -3604,7 +3604,7 @@ def _configuration_args(main_key, argdict, exe, keys=None, default=[], use_compa
     keys = [f'{root_key}{k}' for k in (keys or [''])]
     if root_key in keys:
         if main_key != exe:
-            keys.append((main_key, exe))
+            keys.extend((main_key, exe))
         keys.append('default')
     else:
         use_compat = False