--- a/mercurial/configitems.py Fri Jun 30 01:47:49 2017 +0900 +++ b/mercurial/configitems.py Sat Jul 01 20:16:54 2017 +0200 @@ -78,7 +78,7 @@ default='', ) coreconfigitem('devel', 'serverrequirecert', - default=None, + default=False, ) coreconfigitem('devel', 'strip-obsmarkers', default=True,