type 'a t
val create : ?growth_allowed:bool ‑> ?size:int ‑> (module Base__.Hash_set_intf.Key with type t = 'a) ‑> 'a t
val of_list : ?growth_allowed:bool ‑> ?size:int ‑> (module Base__.Hash_set_intf.Key with type t = 'a) ‑> 'a list ‑> 'a t