macro IS_xxx

[Andrea Zagli <azagli inwind it>]

i have GObject A and GObject B; B is a A's subclass

obj_a = a_new ();
obj_b = b_new ();

(a_new() and b_new() return GObject)

when i call IS_OBJECT_A (obj_b) it returns TRUE: why?

is it a bug? or is it normal? or am i mistaking something?