pub fn compute_receive_window(
  receive_window_size: Int,
  data_size: Int,
) -> #(Int, Int)

pub fn compute_send_size(
  stream_send_window: Int,
  connection_send_window: Int,
  data_size: Int,
) -> Int

pub fn update_send_window(
  current_send_window: Int,
  increment: Int,
) -> Result(Int, String)