As with most other things, it’s current label is: “Waiting until somebody decides to work on it”.
There are many, many ideas out there, and many of them are awesome things to be implemented, but there is only a very tiny handful of devs, and as such the vast majority of those awesome things are going to be stuck in a limbo until someone gets around to them.
To be a tiny bit more specific, since that particular code deals with the inventory code (which is kinda dense), but otherwise doesn’t really have too many things that it would need to change, I’d probably put it in the “could be done by a focuses coder working on it” category. It’s definitely not something that someone is gonna crank out in an hour or two, but it’s nowhere near as much work as some of the bigger features like Z-levels are.