diff -r 006aee5ffd35 -r 33d2f0164d0d mercurial/revlog.py
--- a/mercurial/revlog.py	Tue Sep 26 01:05:02 2023 +0200
+++ b/mercurial/revlog.py	Mon Sep 25 22:52:01 2023 +0200
@@ -1954,13 +1954,11 @@
 
         return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
 
-    def revision(self, nodeorrev, _df=None):
+    def revision(self, nodeorrev):
         """return an uncompressed revision of a given node or revision
         number.
-
-        _df - an existing file handle to read from. (internal-only)
         """
-        return self._revisiondata(nodeorrev, _df)
+        return self._revisiondata(nodeorrev)
 
     def sidedata(self, nodeorrev, _df=None):
         """a map of extra data related to the changeset but not part of the hash