You can search for identifiers within the package.
in-package search v0.2.0
type t = [
| `Bit7
| `Bit8
| `Binary
| `Quoted_printable
| `Base64
| `Ietf_token of string
| `X_token of string
]
val pp : t Fmt.t
val of_string : string -> (t, [> `Msg of string ]) result
val to_string : t -> string