mercurial/configitems.py

--- a/mercurial/configitems.py	Thu Apr 08 16:39:39 2021 +0200
+++ b/mercurial/configitems.py	Thu Apr 08 16:34:11 2021 +0200
@@ -904,6 +904,11 @@
 )
 coreconfigitem(
     b'experimental',
+    b'changegroup4',
+    default=False,
+)
+coreconfigitem(
+    b'experimental',
     b'cleanup-as-archived',
     default=False,
 )