Imperative table indexed by Key
val create : ?size:int ‑> unit ‑> t
val mem : t ‑> _ Key.t ‑> bool
val add : t ‑> 'a Key.t ‑> 'a ‑> unit
val find : t ‑> 'a Key.t ‑> 'a option
val find_exn : t ‑> 'a Key.t ‑> 'a
- Raises Not_found: if the key is not in the table.
val iter : (pair ‑> unit) ‑> t ‑> unit
val add_list : t ‑> pair list ‑> unit
val of_list : pair list ‑> t
val to_list : t ‑> pair list