Yes I did just that (match the ducth comment)
but currently at this place the code contains reasonable things:

                JvY: TODO Controleren of dit blijft werken met andere tijdsimplementaties
                union ud {
                        double   dv;
                        uint64_t uv;
                } value;
#ifdef HOST_IS_BIG_ENDIAN
                memcpy(&(value.uv), theLookahead.encode().data(), sizeof(double));
#else
                value.uv = CERTI_DECODE_DOUBLE_FROM_UINT64BE(theLookahead.encode().data());
#endif
                double lookAheadTime = value.dv;
                req.setLookahead(lookAheadTime);