That's why it'd have to be layers and you'd have to have some clever way of keeping what in each layer goes with which code. I started playing with it a while

That's why it'd have to be layers and you'd have to have some clever way of keeping what in each layer goes with which code. I started playing with it a while back in terms of how you'd structure it and what I came up with was something like foo.cs foo.shallow foo.deep So that all existing tooling would work, foo.cs would just be regular old code and only if your editor supported layers would it care about .shallow and .deep, I didn't like that it would clutter up files. If I ever get the time I'd like to implement a rough prototype in intellij.