mrb_obj_classname(mrb_state *mrb, mrb_value obj)
{
  return mrb_class_name(mrb, mrb_obj_class(mrb, obj));
}
mrb_obj_classname(mrb_state *mrb, mrb_value obj)
{
  return mrb_class_name(mrb, mrb_obj_class(mrb, obj));
}