the $wgMainCacheType settings.
* Callers needing fast light-weight data stores use $wgMainStash to select
the store type from $wgObjectCaches. The default is the local database.
+* Interface message overrides in the MediaWiki namespace will now be cached in
+ memcached and APC (if available), rather than memcached and local files.
==== External libraries ====
* Update es5-shim from v4.0.0 to v4.1.5.
* SpecialPageFactory::setGroup was removed (deprecated in 1.21).
* SpecialPageFactory::getGroup was removed (deprecated in 1.21).
* DatabaseBase::ignoreErrors() is now protected.
+* BREAKING CHANGE: mediawiki.legacy.ajax has been removed, following
+ a lengthy deprecation period.
+* The ScopedPHPTimeout class was removed.
== Compatibility ==