Trying to use generics instead of two seperate functions that do exactly the same thing

generics

type GenericDataPlaneObject interface {
	*dataplanev1beta1.OpenStackDataPlaneRole | *dataplanev1beta1.OpenStackDataPlaneNode
}

// removeControllerManagedAnnotations will check for and remove annotations on Role objects that are managed by a OpenStackDataPlane controller.
func removeControllerManagedAnnotations[T GenericDataPlaneObject](ctx context.Context, instance T, helper *helper.Helper, annotation map[string]string) error {
	client := helper.GetClient()

	// Get all of the current annotations
	annotations := instance.ObjectMeta.GetAnnotations()
	// Remove the redeployProtectionAnnoation
	delete(annotations, "edpm.openstack.org/deploy-protection")
	
	for _, or := range instance.GetObjectMeta().GetOwnerReferences() {
		if *or.Controller {
			instance.ObjectMeta.SetAnnotations(annotations)
			return client.Update(ctx, instance)
		}
	}
	return nil
}

Doesn't love it:

❯ go vet ./...
# github.com/openstack-k8s-operators/dataplane-operator/controllers
controllers/openstackdataplane_controller.go:453:26: instance.ObjectMeta undefined (type T has no field or method ObjectMeta)
controllers/openstackdataplane_controller.go:457:30: instance.GetObjectMeta undefined (type T has no field or method GetObjectMeta)
controllers/openstackdataplane_controller.go:459:13: instance.ObjectMeta undefined (type T has no field or method ObjectMeta)
controllers/openstackdataplane_controller.go:460:30: cannot use instance (variable of type T constrained by GenericDataPlaneObject) as client.Object value in argument to client.Update: T does not implement client.Object (missing method DeepCopyObject)

I'm sure it's something simple that I'm missing.

Same errors with:

// removeControllerManagedAnnotations will check for and remove annotations on Role objects that are managed by a OpenStackDataPlane controller.
func removeControllerManagedAnnotations[T *dataplanev1beta1.OpenStackDataPlaneRole | *dataplanev1beta1.OpenStackDataPlaneNode](ctx context.Context, instance T, helper *helper.Helper, annotation map[string]string) error {
	client := helper.GetClient()

	// Get all of the current annotations
	annotations := instance.ObjectMeta.GetAnnotations()
	// Remove the redeployProtectionAnnoation
	delete(annotations, "edpm.openstack.org/deploy-protection")

	for _, or := range instance.GetObjectMeta().GetOwnerReferences() {
		if *or.Controller {
			instance.ObjectMeta.SetAnnotations(annotations)
			return client.Update(ctx, instance)
		}
	}
	return nil
}

Calling the function like this:

		err = removeControllerManagedAnnotations[*dataplanev1beta1.OpenStackDataPlaneRole](ctx, role, helper, redeployProtectionAnnotation)

It seems like the DeepCopy methods aren't available when these types are passed to the generics.

For example, this method is available on the OpenStackDataPlane* types when used individually.
https://github.com/kubernetes/apimachinery/blob/release-1.26/pkg/apis/meta/v1/meta.go#L131

But when passed to the function as generics, all of the methods that are deep copy methods are not available.