trait Data

pub(open) trait Reader {
  fn _get_internal_buffer(Self) -> ReaderBuffer
  fn _direct_read(Self, FixedArray[Byte], offset~ : Int, max_len~ : Int) -> Int raise
  fn read(Self, FixedArray[Byte], offset? : Int, max_len? : Int) -> Int raise = _
  fn drop(Self, Int) -> Int raise = _
  fn read_exactly(Self, len : Int) -> Bytes raise = _
  fn read_some(Self, max_len? : Int) -> Bytes? raise = _
  fn read_all(Self) -> &Data raise = _
  fn read_until(Self, StringView) -> String? raise = _
}

pub(open) trait Writer {
  fn write_once(Self, BytesView) -> Int raise
  fn write(Self, &Data) -> Unit raise = _
  fn write_reader(Self, &Reader) -> Unit raise = _
}

pub(all) suberror ReaderClosed derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

#internal(internal, "this type is for internal use only")
type ReaderBuffer