diff -r 3ccef7902070 -r b922c767b214 mercurial/commands.py
--- a/mercurial/commands.py	Mon Aug 07 11:08:00 2023 +0200
+++ b/mercurial/commands.py	Sat Aug 19 22:56:14 2023 -0400
@@ -1794,25 +1794,22 @@
 
     Returns 0 on success.
     """
-    opts = pycompat.byteskwargs(opts)
-    rev = opts.get(b'rev')
+    rev = opts.get('rev')
     if rev:
         repo = scmutil.unhidehashlikerevs(repo, [rev], b'nowarn')
     ctx = logcmdutil.revsingle(repo, rev)
-    m = scmutil.match(ctx, (file1,) + pats, opts)
-    fntemplate = opts.pop(b'output', b'')
+    m = scmutil.match(ctx, (file1,) + pats, pycompat.byteskwargs(opts))
+    fntemplate = opts.pop('output', b'')
     if cmdutil.isstdiofilename(fntemplate):
         fntemplate = b''
 
     if fntemplate:
-        fm = formatter.nullformatter(ui, b'cat', opts)
+        fm = formatter.nullformatter(ui, b'cat', pycompat.byteskwargs(opts))
     else:
         ui.pager(b'cat')
-        fm = ui.formatter(b'cat', opts)
+        fm = ui.formatter(b'cat', pycompat.byteskwargs(opts))
     with fm:
-        return cmdutil.cat(
-            ui, repo, ctx, m, fm, fntemplate, b'', **pycompat.strkwargs(opts)
-        )
+        return cmdutil.cat(ui, repo, ctx, m, fm, fntemplate, b'', **opts)
 
 
 @command(