hashNub -package:witherable

Like nub but runs in <math> time and requires Hashable.
>>> hashNub [3, 3, 3, 2, 2, -1, 1]
[3,2,-1,1]
same behavior as nub, but requires Hashable & Eq and is O(n log n) https://github.com/nh2/haskell-ordnub
Like nub but runs in O(n * log_16(n)) time and requires Hashable.
>>> hashNub [3, 3, 3, 2, 2, -1, 1]
[3,2,-1,1]