I just filed a bug (#2250) on article validation, based on test.leuksman.com behaviour.

1. Magnus, is this a useful thing to do? Should a tracking bug for the 1.5 release version be created?

2. Brion, you've mentioned you'd prefer the feature to be an extension - should bugs presently be filed under MediaWiki or under MediaWiki Extensions?

3. Anything else to make bug filing as useful as possible?

(apart from learning enough PHP myself, of course)

- d.