}

		if crd.Spec.PreserveUnknownFields == false {
			// we don't own s completely, e.g. defaults are not deep-copied. So better make a copy here.
			s = s.DeepCopy()

			if err := structuraldefaulting.PruneDefaults(s); err != nil {
				// This should never happen. If it does, it is a programming error.
				utilruntime.HandleError(fmt.Errorf("failed to prune defaults: %v", err))

		return false, err
	}
	if errs := structuralschema.ValidateStructural(nil, ss); len(errs) > 0 {
		return false, errs.ToAggregate()
	}
	pruned := ss.DeepCopy()
	if err := structuraldefaulting.PruneDefaults(pruned); err != nil {
		return false, err
	}
	return !reflect.DeepEqual(ss, pruned), nil
}