--- a/mercurial/configitems.py	Mon Jul 06 17:51:18 2020 +0200
+++ b/mercurial/configitems.py	Sat Jun 27 21:46:23 2020 +0900
@@ -212,6 +212,9 @@
     default=lambda: [b'chgserver', b'cmdserver', b'repocache'],
 )
 coreconfigitem(
+    b'cmdserver', b'shutdown-on-interrupt', default=True,
+)
+coreconfigitem(
     b'color', b'.*', default=None, generic=True,
 )
 coreconfigitem(