Asymptotically optimal Brodal/Okasaki bootstrapped skew-binomial heaps from the
paper "Optimal Purely Functional Priority Queues"
(http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.48.973), extended with
a Foldable interface.

Homepage:
http://hackage.haskell.org/package/heaps
