tbh I'll still take it over a similar Gordian knot with interfaces. At least you can tell the restrictions are met at compile time, rather than silently failin

tbh I'll still take it over a similar Gordian knot with interfaces. At least you can tell the restrictions are met at compile time, rather than silently failing at runtime because you (and/or someone else in the past) didn't notice one edge case lodged somewhere surprising.