There is probably one bug.
if it is 100% for quality chance and the item gets to the last upgrade, then as soon as it goes through Sink again, it is deleted. Can you not delete these items and just let them "flow" through Sink?

or just don't sink them in the first place :)

(i didn't want my mod to act as a legendary quality item teleport)

Like sure, I can put a Splitter in there and say the last quality "here", but somehow I find it a mystery why it deletes the item when there is no higher quality to improve it to and the chance is 100% or the evaluation is "upgrade" :)

well that's what the real awesome sink does too, after you dump your first ticket in you get nothing and it just voids it

OK, if it was meant to be.. I thought it was a bug, that if it doesn't find another upgrade, it shouldn't delete it, but only delete it if there is no chance of an upgrade.
I'll just put filters there... I just have to make sure they're of the latest quality

if you ever add a new quality it'll still have remembered the items you had put in (and possibly editing legendary quality to make legendary quality its next upgrade would make them output all legendary items again)