From Adrian Lang's email to wikitech-l http://www.gossamer-threads.com/lists/wiki/wikitech/452196:

• The shims for $wgExtensionMessagesFiles as generated by

maintenance/generateJsonI18n.php register a handler for the hook
LocalisationCacheRecache when included

That is true even in 1.23; LocalisationCache still includes the shims to get non-message data "For backwards compatibility [...] Variables other than $messages still need to be supported though.".

However, in practice, non-message data are contained in separate files; it is unnecessary to load the shims.

Version: 1.23.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=63928