Hi all, Since the release of deepseq 1.2, we've had a bit of a problem: when using the newest versions of packages on Hackage, there is no NFData instance available for the containers types. When GHC 7.4 comes out with its newer version of containers, this will be addressed, but we'll still have problems for users of older GHC releases. I'd like to suggest a solution: a new package called containers-deepseq. Using conditional compilation, it will provide an orphans NFData instance for all containers types when deepseq >= 1.2 and containers < 0.5. Packages (e.g., aeson) would then depend on containers-deepseq and simply import the module whenever they rely on the NFData instances. When GHC 7.4 comes out, the package will essentially be a no-op. Does this make sense? Michael