Last modified: 2013-03-23 13:55:02 UTC
Created attachment 11976 [details] screenshot of duplicate content If you use the sandbox on en.wp and try to make a query on revisions of a certain title, you will see that the properties for prop=revisions shows all the parameters twice. If you make the query, you will note the same in the query URL &titles=Title&titles=Title Verified with Safari 6.0.3
This was fixed in Gerrit change #52296, merged March 6 so it missed the wmf11 cutoff. It is in wmf12. See https://www.mediawiki.org/wiki/MediaWiki_1.21/Roadmap for the release schedule.