mercurial/debugcommands.py

--- a/mercurial/debugcommands.py	Mon Aug 21 17:26:56 2023 -0400
+++ b/mercurial/debugcommands.py	Mon Aug 21 17:29:05 2023 -0400
@@ -2827,8 +2827,7 @@
 def debugp1copies(ui, repo, **opts):
     """dump copy information compared to p1"""
 
-    opts = pycompat.byteskwargs(opts)
-    ctx = scmutil.revsingle(repo, opts.get(b'rev'), default=None)
+    ctx = scmutil.revsingle(repo, opts.get('rev'), default=None)
     for dst, src in ctx.p1copies().items():
         ui.write(b'%s -> %s\n' % (src, dst))