The fastest libraries are missing: vector-hashtables, clutter, finite

[unhammer]

Well, fastest on a frequency count challenge :)
cf. https://github.com/unhammer/countwords/blob/hs/haskell/README.md#compare-the-haskell-versions

[unhammer]

It would also be interesting to compare:

• https://hackage.haskell.org/package/btree
• Overhaul sergv/radix-tree#1