# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2017-06-25 12:38:56
# Node ID 1dc2ffe0123b53271a4ce3858f1c15add011a2cf
# Parent  1aa05203f7f66e8566ce6e92cc3451a9b7ce15c3

config: use '_config' within 'configbool'

This will prevent bugs from using None as the sentinel value (eg:
'ui.interactive')

diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -540,8 +540,10 @@ class ui(object):
         ConfigError: foo.invalid is not a boolean ('somevalue')
         """
 
-        v = self.config(section, name, default, untrusted=untrusted)
+        v = self._config(section, name, default, untrusted=untrusted)
         if v is None:
+            return v
+        if v is _unset:
             if default is _unset:
                 return False
             return default