code: void
  toWire(DNSOutput out) {
  	out.writeU16(code);
  	int lengthPosition = out.current();
  	out.writeU16(0); /* until we know better */
  	optionToWire(out);
  	int length = out.current() - lengthPosition - 2;
  	out.writeU16At(length, lengthPosition);
  }
docs: Converts an EDNS Option (including code and length) into wire format.
  @param out The output stream.