* DatabaseBase::errorCount() was removed (unused).
* $wgDeferredUpdateList was removed.
* DeferredUpdates::addHTMLCacheUpdate() was removed.
+* The default name of the 'suppress' group page has been changed from
+ 'Project:Oversight' to 'Project:Suppress'.
+* (T84937) Free external links ("autolinked" urls) will now be terminated
+ by and HTML entity encodings of  , <, and >.
== Compatibility ==