--- a/mercurial/configitems.py	Sat Aug 25 01:19:48 2018 +0200
+++ b/mercurial/configitems.py	Thu May 24 09:59:10 2018 +0200
@@ -679,6 +679,9 @@
 coreconfigitem('format', 'usestore',
     default=True,
 )
+coreconfigitem('format', 'internal-phase',
+    default=False,
+)
 coreconfigitem('fsmonitor', 'warn_when_unused',
     default=True,
 )