code: def pack(self, value=None):
          
          # Set the correct IHL based on options size
          if self.options:
              self.ihl += int(len(self.options) / 4)
  
          # Set the correct packet length based on header length and data
          self.length = int(self.ihl * 4 + len(self.data))
  
          self._version_ihl = self.version << 4 | self.ihl
          self._dscp_ecn = self.dscp << 2 | self.ecn
          self._flags_offset = self.flags << 13 | self.offset
  
          # Set the checksum field before packing
          self._update_checksum()
  
          return super().pack()
docs: Pack the struct in a binary representation.
  
          Merge some fields to ensure correct packing.
  
          Returns:
              bytes: Binary representation of this instance.