requesting specific Cabal version

Hello Haskell, what about adding to .cabal file ability to ask for specific Cabal version? it will allow to make incompatible changes between Cabal versions. program that uses services specific to Cabal 1.4.x, for example, will just ask for using this Cabal version and operation will go fine of course, it will require to have cabal 1.4.x, 1.6.x and other versions simultaneously installed - just like now it's possible (in ghc) to have different versions of any other lib installed together -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com