mercurial/upgrade_utils/actions.py

--- a/mercurial/upgrade_utils/actions.py	Tue Feb 20 10:47:47 2024 -0500
+++ b/mercurial/upgrade_utils/actions.py	Wed Feb 21 11:53:30 2024 +0100
@@ -501,7 +501,7 @@
             level = repo.ui.configint(b'storage', b'revlog.zstd.level')
         if level is None:
             return b'default'
-        return bytes(level)
+        return b"%d" % level
 
     @classmethod
     def fromconfig(cls, repo):
@@ -513,7 +513,7 @@
             level = repo.ui.configint(b'storage', b'revlog.zstd.level')
         if level is None:
             return b'default'
-        return bytes(level)
+        return b"%d" % level
 
 
 def find_format_upgrades(repo):