Oneboxing follows redirects and that seems to be the wanted behavior and I think it’s useful for most cases.
However, I just noticed that the mini oneboxing doesn’t seem to follow redirects. I tried 301 and 302 and doesn’t seem to make a difference — only seems to work for 200 replies.
Hmm, that is up to @sam, I think the mini oneboxer isn’t intended to be as thorough so I am not sure it should follow redirects, which is fairly complex.