* DB_SLAVE is deprecated. DB_REPLICA should be used instead.
* wfUsePHP() is deprecated.
* wfFixSessionID() was removed.
-* wfShellExec() and related functions are deprecated, use Shell::command().
+* wfShellExec() and related functions are deprecated, use Shell::command(). This also
+ slightly changes the behavior of how execution time limits are calculated when only
+ some of defaults are overridden per-call. When in doubt, always override both wall
+ clock and CPU time.
* (T138166) SpecialEmailUser::getTarget() now requires a second argument, the sending
user object. Using the method without the second argument is deprecated.
* (T67297) Browsers that don't support Unicode will have their edits rejected.