@spec pack_exception(0..255, 1..127, atom()) :: binary()

@spec pack_req(tuple()) :: binary()

@spec pack_res(tuple(), list() | nil) :: binary()

@spec parse_req(binary(), map()) :: {:ok, tuple()} | {:error, atom(), integer() | nil}

@spec parse_res(tuple(), binary()) :: list() | nil | {:error, term()}

@spec response_fits?(tuple()) :: boolean()

@spec response_length(tuple(), binary()) ::
  {:ok, pos_integer()} | :more | {:error, term()}