I don't see no reason to not to default to array() instead of null.
*/
$wgLocalMessageCacheSerialized = true;
+/**
+ * Instead of caching everything, keep track which messages are requested and
+ * load only most used messages. This only makes sense if there is lots of
+ * interface messages customised in the wiki (like hundreds in many languages).
+ */
+$wgAdaptiveMessageCache = false;
+
/**
* Localisation cache configuration. Associative array with keys:
* class: The class to use. May be overridden by extensions.
# 102 => "Aide",
# 103 => "Discussion_Aide"
# );
-$wgExtraNamespaces = null;
+$wgExtraNamespaces = array();
/**
* Namespace aliases