code: func newClientStore(store stores.Store) *clientStore {
  	return &clientStore{
  		clients:      make(map[string]*client),
  		connIDs:      make(map[string]*client),
  		knownInvalid: make(map[string]struct{}),
  		store:        store,
  	}
  }
docs: // newClientStore creates a new clientStore instance using `store` as the backing storage.