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