mercurial/bundle2.py

--- a/mercurial/bundle2.py	Thu Oct 17 19:29:22 2019 -0400
+++ b/mercurial/bundle2.py	Fri Nov 08 23:26:50 2019 +0900
@@ -861,7 +861,7 @@
         needed to move forward to get general delta enabled.
         """
         yield self._magicstring
-        assert b'params' not in vars(self)
+        assert 'params' not in vars(self)
         paramssize = self._unpack(_fstreamparamsize)[0]
         if paramssize < 0:
             raise error.BundleValueError(