code: func GetMaximumDHCPMessageSize(o dhcp4.Options) (uint16, error) {
  	v := o.Get(dhcp4.OptionMaximumDHCPMessageSize)
  	if v == nil {
  		return 0, dhcp4.ErrOptionNotPresent
  	}
  	var u Uint16
  	return uint16(u), (&u).UnmarshalBinary(v)
  }
docs: // GetMaximumDHCPMessageSize returns the maximum DHCP message size of `o`.
  //
  // The maximum DHCP message size option is defined by RFC 2132, Section 9.10.