// storageVersionHash as empty in the discovery document.
	StorageVersioner runtime.GroupVersioner

	// DestroyFunc cleans up clients used by the underlying Storage; optional.
	// If set, DestroyFunc has to be implemented in thread-safe way and
	// be prepared for being called more than once.
	DestroyFunc func()
}

// Note: the rest.StandardStorage interface aggregates the common REST verbs

	for _, crdInfo := range storageMap {
		for _, storage := range crdInfo.storages {
			// DestroyFunc have to be implemented in idempotent way,
			// so the potential race with r.tearDown() (being called
			// from a goroutine) is safe.
			storage.CustomResource.DestroyFunc()
		}
	}
}

// GetCustomResourceListerCollectionDeleter returns the ListerCollectionDeleter of
// the given crd.