oh, i'm not in a good mood today 'coz of 1st time i got a THREATEN here on XS by someone big.

about opb's tweak.
yes, it's complicated and may not be that easy to fully understand.
same here, i also got tons of questions about that and totally shocked by the performance he shows.
but, i will not doubt him but will try myself to see if i can catch up with him.
if not, i'll ask him in person for some hints.
this is the way what I think is the right way we should go in such situation.
that's not easy to find and post such a tweak.