I’ve just released version 1.0 of a haskell library for principled, cross-platform & extensible hashing of types. It is available on hackage, and can be installed with:
cabal install hashabler
(see my initial announcement post which has some motivation and pretty pictures)
You can see the CHANGELOG but the main change is an implementation of SipHash. It’s about as fast as our implementation of FNV-1a for bytestrings of length fifty and slightly faster when you get to length 1000 or so, so you should use it unless you’re wanting a hash with a simple implementation.
If you’re implementing a new hashing algorithm or hash-based data structure, please consider using hashabler instead of hashable.