prop=revisions has long ordered revisions by rev_id rather than timestamp when returning results for a single page. In most cases this doesn't make a difference, but for old pages imported from earlier versions of Wikipedia, for revisions imported from Special:Import, and so on these orderings don't always match.

prop=revisions has now been updated[1] to order by timestamp rather than id. While this is technically a breaking change, it seems unlikely that any clients will actually be broken by this.

This should be deployed to WMF wikis with 1.26wmf4, see https://www.mediawiki.org/wiki/MediaWiki_1.26/Roadmap for the schedule.

[1]: https://gerrit.wikimedia.org/r/#/c/188843/

--

Brad Jorsch (Anomie)
Software Engineer
Wikimedia Foundation

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