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Why were the follow-ups not done just by adding NS_USER to Namespace::$alwaysCapitalizedNamespaces??
We can have both, done in r60063. Some pages will be made inaccessible when this commit and r60053 are deployed, and they will need to be cleaned up, by running something like cleanupTitles.php. Marking this as scaptrap for that reason. Better documentation of this issue would be useful for the 1.16 release.