sig
val validate : string -> bool
val length : string -> int
val from_unichar : Glib.unichar -> string
val from_unistring : Glib.unistring -> string
val to_unichar : string -> pos:int Pervasives.ref -> Glib.unichar
val to_unistring : string -> Glib.unistring
val first_char : string -> Glib.unichar
end