diff -r e67522413ca8 -r 762ef19a07e3 mercurial/configitems.py
--- a/mercurial/configitems.py	Mon Oct 08 17:10:59 2018 -0700
+++ b/mercurial/configitems.py	Mon Oct 08 17:00:16 2018 -0700
@@ -574,6 +574,9 @@
 coreconfigitem('experimental', 'httppeer.advertise-v2',
     default=False,
 )
+coreconfigitem('experimental', 'httppeer.v2-encoder-order',
+    default=None,
+)
 coreconfigitem('experimental', 'httppostargs',
     default=False,
 )