F.Hash
val description : string
type state
val fold_int : state -> int -> state
val fold_int64 : state -> int64 -> state
val fold_float : state -> float -> state
val fold_string : state -> string -> state
type seed
val alloc : unit -> state
val reset : ?seed:seed -> state -> state
type hash_value
val get_hash_value : state -> hash_value
module For_tests : sig ... end