In essence, being able to store item stacks from XNet networks inside a Database Upgrade for NBT comparison purposes.

I will look into it!

You might want to call it .store(), as per the contract the Inventory Controller Upgrade and Transposer already use. But yes, this is exactly what I had in mind.

I assume the slot number can be acquired via getItems()/etc.?

Does this work for you or did you have something else in mind?

Yes, you can get the slot number from getItems(). I've added a few example outputs to the readme.

Great, thanks!