code: func (strategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
  	newClusterRoleBinding := obj.(*rbac.ClusterRoleBinding)
  	oldClusterRoleBinding := old.(*rbac.ClusterRoleBinding)
  
  	_, _ = newClusterRoleBinding, oldClusterRoleBinding
  }
docs: // PrepareForUpdate clears fields that are not allowed to be set by end users on update.