diff -r f7673845b167 -r 89a16704114c mercurial/wireprotov2peer.py
--- a/mercurial/wireprotov2peer.py	Sat Apr 14 11:49:06 2018 -0700
+++ b/mercurial/wireprotov2peer.py	Sat Apr 14 12:07:31 2018 -0700
@@ -25,7 +25,6 @@
         self.requestid = requestid
         self.command = command
 
-        self.cbor = False
         self.b = util.bytesio()
 
     def cborobjects(self):
@@ -124,9 +123,6 @@
         if action == 'responsedata':
             response.b.write(meta['data'])
 
-            if meta['cbor']:
-                response.cbor = True
-
             if meta['eos']:
                 # If the command has a decoder, resolve the future to the
                 # decoded value. Otherwise resolve to the rich response object.