code: def append(self, data: Union[bytes, bytearray, memoryview]) -> None:
          
          size = len(data)
          if size > self._large_buf_threshold:
              if not isinstance(data, memoryview):
                  data = memoryview(data)
              self._buffers.append((True, data))
          elif size > 0:
              if self._buffers:
                  is_memview, b = self._buffers[-1]
                  new_buf = is_memview or len(b) >= self._large_buf_threshold
              else:
                  new_buf = True
              if new_buf:
                  self._buffers.append((False, bytearray(data)))
              else:
                  b += data  # type: ignore
  
          self._size += size
docs: Append the given piece of data (should be a buffer-compatible object).