@spec available?() :: boolean()

@spec backend() :: module()

@spec recall(
  String.t(),
  keyword()
) :: {:ok, [map()]} | {:error, term()}

@spec reflect(
  String.t() | atom(),
  keyword()
) :: {:ok, term()} | {:error, term()}

@spec retain(String.t(), map(), keyword()) :: :ok

@spec retain_sync(String.t(), map(), keyword()) :: {:ok, map()} | {:error, term()}