the gobject.Closure to which the marshaller belongs
ignored
2
a gobject.Value array holding the instance and the gobject.ParamSpec* parameter
the invocation hint given as the last argument to Closure.invoke
additional data specified when registering the marshaller
A marshaller for a gobject.CClosure with a callback of type void (*callback) (gpointer instance, GParamSpec *arg1, gpointer user_data).