tibbe/unordered-containers — pull request #28 by twanvl (2012-02-23 22:17:10+00:00)
Title: Hamt

I implemented an efficient union algorithm, as discussed [1].

Yes, it passes the quickCheck tests.

[1] http://www.reddit.com/r/haskell/comments/q0a02/wanted_an_efficient_union_algorithm_for_hasharray/