hi i'm curious about the specifics of how the determinate nix garbage collection works? Will garbage collection just remove unused nix store data? Or will it clear revisions automatically? Are there toggles or is it always set for some specific threshold? Like 30% space or whatever? I like the automated cleanup nature of this, running as a service outside of when I'm actively running nix commands. What I'm less clear on is what it's really doing. I would want it to use most of my disk at any given time.