--- a/mercurial/repair.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/repair.py	Mon Feb 21 13:08:28 2022 -0700
@@ -379,7 +379,7 @@
     return [c.node() for c in repo.set(b'roots(%ld)', tostrip)]
 
 
-class stripcallback(object):
+class stripcallback:
     """used as a transaction postclose callback"""
 
     def __init__(self, ui, repo, backup, topic):