tibbe/hashable — pull request #34 by bos (2012-12-12 00:13:07+00:00)
Title: An almost complete rewrite

Major changes:

* Uses SipHash for `ByteString` and `Text`, with versions optimized for x86_64 and SSE4.1
* Supports efficient boilerplate-free generic hashing (huge ease-of-use win!)
* Uses Thomas Wang's integer hashing functions for integers
* Removes `hash` from the `Hashable` class, leaving only `hashWithSalt`
* Dropped the `combine` function