I really like this idea - I keep finding myself re-implementing something like it every time I hit the brick wall of blanket impls. I'll see if there's a good p

I really like this idea - I keep finding myself re-implementing something like it every time I hit the brick wall of blanket impls. I'll see if there's a good place to make use of it in some of my current work at Gel (mainly trying to develop an ergonomic system for building postgres-style wire messages right now).