I would also be interested in this knot as it is of a class that clamps the line before the line bends so should be relatively strong. Of somewhat more interest for my boat would be does it slip in Amsteel and I will test that later today.I'd also like to see the Halyard hitch as this is currently the knot holding up New Morning's mainsail. Splicing an older line is pretty challenging, but so is replacing a 200' 12mm vectran halyard. When a chafe problem caused some worry, I swapped the halyard end for end and used a halyard hitch to attach to the shackle. I'm curious to know how much weaker that is than a splice.
That all said, I don't think for a halyard anyone is going to get close to having to worry about the strength of either the line or the knot. Halyards are sized for stretch so the loads are way under breaking strength.