Gobject.Value
val create_empty : unit -> g_value
val release : g_value -> unit
val reset : g_value -> unit
val get_pointer : g_value -> Gpointer.boxed
val get_nativeint : g_value -> nativeint
val get_int32 : g_value -> int32
val get_conv : data_kind -> g_value -> data_conv_get