`sig
type buf
val create : int -> CamomileLibrary.UCS4.Buf.buf
val contents : CamomileLibrary.UCS4.Buf.buf -> CamomileLibrary.UCS4.t
val clear : CamomileLibrary.UCS4.Buf.buf -> unit
val reset : CamomileLibrary.UCS4.Buf.buf -> unit
val add_char :
CamomileLibrary.UCS4.Buf.buf -> CamomileLibrary.UChar.t -> unit
val add_string :
CamomileLibrary.UCS4.Buf.buf -> CamomileLibrary.UCS4.t -> unit
val add_buffer :
CamomileLibrary.UCS4.Buf.buf -> CamomileLibrary.UCS4.Buf.buf -> unit
end`