I think the hashetable package has a bit of a different performance / use case profile than the functional hash map data structure. Also I believe you need to

I think the hashetable package has a bit of a different performance / use case profile than the functional hash map data structure. Also I believe you need to spend more effort tuning which type of hashtable and your choice of hash function based upon your use case/ blend of operations. Some of the hashtable options regress to linear time insertions and lookups under certain use cases and load factors