diff -r 80e0ea08b55c -r 3de4f17f4824 mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jun 28 22:57:48 2019 +0530
+++ b/mercurial/configitems.py	Fri Jun 28 21:31:34 2019 +0530
@@ -1091,6 +1091,9 @@
 coreconfigitem('share', 'poolnaming',
     default='identity',
 )
+coreconfigitem('shelve','maxbackups',
+    default=10,
+)
 coreconfigitem('smtp', 'host',
     default=None,
 )