* (bug 24620) Add types to LogFormatter.
* jQuery JSON upgraded from 2.3 to 2.4.0.
* Added GetDoubleUnderscoreIDs hook, for modifying the list of magic words.
+* DatabaseUpdater class has two new methods to ease extensions schema changes:
+ dropExtensionIndex and renameExtensionIndex.
=== Bug fixes in 1.21 ===
* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.