[Haskell-cafe] Package for QuickCheck instances

Hi Haskell, I was writing some tests that involved a large number of quickcheck properties which don't ship with the library itself, so I thought I would package them all together and put the orphan instances on Hackage. Here's what I have so far: https://github.com/aslatter/qc-instances/tree/93a87fa06b5575ddcc12c2f9eb0f46... The policy would be to allow anything into to package which is a part of the Haskell Platform or is a GHC build library. Has anyone already done this? I didn't find anything from grepping the Hackage package list. Has anyone already talked about doing this sort of thing? Are their any non-obvious pitfalls (aside from the package eventually becoming a cesspool of CPP conditions)? Thanks, Antoine