val freeze_notify : 'a obj -> unit
val thaw_notify : 'a obj -> unit
val notify : 'a obj -> string -> unit
val set_value : 'a obj -> string -> g_value -> unit
val get_value : 'a obj -> string -> g_value -> unit
val get_some : 'a obj -> ('a, 'b option) property -> 'b
val may_cons_opt :
('a, 'b option) property ->
'b option ->
'a param list ->
'a param list