* A temporary feature flag, $wgDisableUserGroupExpiry, is provided to disable
new features that rely on the schema changes to the user_groups table. This
feature flag will likely be removed before 1.29 is released.
+* (T158474) "Unknown user" has been added to $wgReservedUsernames.
=== New features in 1.29 ===
* (T5233) A cookie can now be set when a user is autoblocked, to track that user