Used in WikiImporter when importing revisions with no author
(e.g. when the author of the exported edit was revision-deleted).
Follow-up to changes related to T121338.
Bug: T158474
Change-Id: I49f3d5b9a23a0535c51a733d8837a681f6e51959
* 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
'Maintenance script', // Maintenance scripts which perform editing, image import script
'Template namespace initialisation script', // Used in 1.2->1.3 upgrade
'ScriptImporter', // Default user name used by maintenance/importSiteScripts.php
+ 'Unknown user', // Used in WikiImporter when importing revisions with no author
'msg:double-redirect-fixer', // Automatic double redirect fix
'msg:usermessage-editor', // Default user for leaving user messages
'msg:proxyblocker', // For $wgProxyList and Special:Blockme (removed in 1.22)