I had to drop this as a comment.
Thank you for making this. It works amazingly well so far. It's extremely fast too.
I have a modded container that has 2,000 slots. I use them for most things, but there's one that I use as a dump/robot drop-off for extra things that I don't need. I usually don't have to go into it, but when I do it was a complete disaster, stone here, locomotive there, loco down there, etc. Now it's all nicely sorted.
It seems to work properly on v1.1.94 (for those wondering if it still works on newer versions, up to 1.1.94)