You can search for identifiers within the package.
in-package search v0.2.0
type state
val init_default : unit -> state
val init_lc_2exp : 'a Mpz.tt -> int -> int -> state
val init_lc_2exp_size : int -> state
val seed : state -> 'a Mpz.tt -> unit
val seed_ui : state -> int -> unit
module Mpz : sig ... end
module Mpf : sig ... end
module Mpfr : sig ... end