--- a/mercurial/wireprotov1server.py	Wed May 31 12:02:56 2023 -0300
+++ b/mercurial/wireprotov1server.py	Thu Feb 02 17:18:24 2023 +0100
@@ -665,7 +665,7 @@
                 r = exchange.unbundle(
                     repo, gen, their_heads, b'serve', proto.client()
                 )
-                if util.safehasattr(r, b'addpart'):
+                if util.safehasattr(r, 'addpart'):
                     # The return looks streamable, we are in the bundle2 case
                     # and should return a stream.
                     return wireprototypes.streamreslegacy(gen=r.getchunks())