diff -r 9f33d12f6f48 -r 698ffff7024b mercurial/configitems.py
--- a/mercurial/configitems.py	Thu Apr 13 04:12:31 2023 +0200
+++ b/mercurial/configitems.py	Thu Apr 13 11:28:48 2023 +0200
@@ -688,9 +688,11 @@
     b'servercafile',
     default=b'',
 )
+# This config option is intended for use in tests only. It is a giant
+# footgun to kill security. Don't define it.
 coreconfigitem(
     b'devel',
-    b'serverexactprotocol',
+    b'server-insecure-exact-protocol',
     default=b'',
 )
 coreconfigitem(