Hashset.Maketype elt = E.tType of hashsets elements.
val create : int -> tcreate n creates a fresh hashset with initial size n.
val clear : t -> unitClear the contents of a hashset.
repr key constr set uses key to look for constr in the hashet set. If constr is in set, returns the specific representation that is stored in set. Otherwise, constr is stored in set and will be used as the canonical representation of this value in the future.
val stats : t -> statisticsRecover statistics on the table.