diff -r 33d2f0164d0d -r 14de15825253 mercurial/revlog.py
--- a/mercurial/revlog.py	Mon Sep 25 22:52:01 2023 +0200
+++ b/mercurial/revlog.py	Tue Sep 26 00:54:46 2023 +0200
@@ -2099,12 +2099,9 @@
         sidedata = sidedatautil.deserialize_sidedata(segment)
         return sidedata
 
-    def rawdata(self, nodeorrev, _df=None):
-        """return an uncompressed raw data of a given node or revision number.
-
-        _df - an existing file handle to read from. (internal-only)
-        """
-        return self._revisiondata(nodeorrev, _df, raw=True)
+    def rawdata(self, nodeorrev):
+        """return an uncompressed raw data of a given node or revision number."""
+        return self._revisiondata(nodeorrev, raw=True)
 
     def hash(self, text, p1, p2):
         """Compute a node hash.