Over two years ago I submitted a bug regarding the lack of size
information for revisions made before May 2007.
Having access to this information is important to study the evolution
of MediaWiki articles. Also, it would greatly reduce the burden put
over the current API.
The bug is almost solved. A script to update the database was written
and is ready to be run.
So, if you care about historical information (or simply about data
consistency) in MediaWiki, please consider voting:
Thanks (for your vote)!