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I'm currently running into issues during development because I need 1.7 for stuff on the front-end of the site, but this is breaking administration pages for modules that are looking for an older version (like Views). This is really annoying, especially because it fails silently, and I don't really want to touch admin pages.
I'm not sure if this is something you guys are willing to consider, but I figured I'd give the patch a shot just in case, because I think it would be helpful.