* Add deferrable update support for callback/closure
* Add TitleMove hook before page renames
* Revision deletion backend code is moved out of SpecialRevisiondelete
+* Add a variable (wgRedactedFunctionArguments) to redact the values sent as certain function
+ parameters from exception stack traces.
=== Bug fixes in 1.22 ===
* Disable Special:PasswordReset when $wgEnableEmail is false. Previously one