Terrain hole feature request

So one issue with terrain holes is the collider/navmesh capabilities don't match what you can do in the shader. You can clip precisely in the shader but due to how geometry can span large height differences not so much with the collider.

So it would be nice to have the bool turn into a feature bit mask. In a clean room terrain implementation this wouldn't have to cause much if any performance issues. No idea what the current system looks like, at least I would ask keep it in mind for DOTS terrain when you guys get around to that.