could we enforce redirects on permalink structure changes?

[Denis-de-Bernardy]

if someone uses the date & named based structure, and then decide to switch to the archives/%post_id% structure, he gets tons of 404 on his sites. the permalink redirect plugin on which the canonical redirect code is based had an option to configure an old permalink structure. ideally, this would be tracked as the permalink structures are changed instead.

[ninjaWR]

works for me on r9840, guess it got done along the way

127.0.0.1 - - [21/Nov/2008:23:44:28 -0500] "GET /2008/11/4449-test/ HTTP/1.1" 301 -
127.0.0.1 - - [21/Nov/2008:23:44:28 -0500] "GET /archives/18 HTTP/1.1" 200 5124