diff -r b162229ebe0d -r 526750cdd02d mercurial/configitems.py
--- a/mercurial/configitems.py	Thu May 16 08:15:20 2019 +0900
+++ b/mercurial/configitems.py	Wed May 15 22:09:02 2019 -0700
@@ -676,6 +676,9 @@
     default=None,
     generic=True,
 )
+coreconfigitem('format', 'bookmarks-in-store',
+    default=False,
+)
 coreconfigitem('format', 'chunkcachesize',
     default=None,
 )