Proposal: Add NFData instances for strict and lazy ByteStrings

While I was hunting for a space leak in the new hackage-server (still haven't found it) I noticed strict and lazy ByteStrings don't have NFData instances. I propose to add them because it enables users to force ByteStrings in the principled way (using deepseq) so they don't need to use tricks like: B.length b `seq` ... instance NFData Strict.ByteString instance NFData Lazy.ByteString where rnf Empty = () rnf (Chunk _ b) = rnf b Note that the containers dependency of deepseq was recently dropped so depending on that package is not a big issue anymore. Discussion deadline: 2 weeks from now (9 November) Bas