production.
=== Configuration changes in 1.21 ===
+* (bug 29374) $wgVectorUseSimpleSearch is now enabled by default.
=== New features in 1.21 ===
=== Bug fixes in 1.21 ===
+* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.
+* (bug 40352) fixDoubleRedirects.php should support interwiki redirects.
+* (bug 9237) SpecialBrokenRedirect should not list interwiki redirects.
+* (bug 34960) Drop unused fields rc_moved_to_ns and rc_moved_to_title from recentchanges table.
=== API changes in 1.21 ===
+* (bug 35693) ApiQueryImageInfo now suppresses errors when unserializing metadata.
=== Languages updated in 1.21 ===