You can search for identifiers within the package.
in-package search v0.2.0
module E : sig ... end
val int32 : [> `Float of float | `Int of int | `Null | `String of string ] -> string -> string -> int32
val float : [> `Float of float | `Int of int | `Null | `String of string ] -> string -> string -> float
val int64 : [> `Float of float | `Int of int | `Null | `String of string ] -> string -> string -> int64
val int : [> `Float of float | `Int of int | `Null | `String of string ] -> string -> string -> int
val string : [> `Null | `String of string ] -> string -> string -> string
val bool : [> `Bool of bool | `Null ] -> string -> string -> bool
val bytes : 'a -> string -> string -> 'b
val make_bool : 'a -> [> `Bool of 'a ]
val make_int : 'a -> [> `Int of 'a ]
val make_float : 'a -> [> `Float of 'a ]
val make_string : 'a -> [> `String of 'a ]
val make_list : 'a -> [> `List of 'a ]