code: async def load_uint(reader, width):
      
      buffer = _UINT_BUFFER
      result = 0
      shift = 0
      for _ in range(width):
          await reader.areadinto(buffer)
          result += buffer[0] << shift
          shift += 8
      return result
docs: Constant-width integer serialization
      :param reader:
      :param width:
      :return: