[Haskell-beginners] cabal: updating a package

[Obscaenvs]

Hi there! Excuse me, but I am a bit bewildered; should I really have to 
give cabal --force-reinstalls to upgrade yesod to the new version 
1.1.0.2? It says a lot of packages are likely to be broken, as per the 
paste http://pastebin.com/cYdZkShu.

I was under the impression I had RTFM, but maybe I have missed something?

/Fredrik
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