Selection Output Socket for Mesh Boolean Node

I think it would be extremely useful for the Mesh Boolean node to have a selection output socket that selects the new geometry generated by the node (except of course for Intersect mode, which creates entirely new geometry).

Below is a mockup of what this would look like in action, using the selection output to drive the distribution of points.

One extremely helpful use case of this would be as a temporary solution to the Mesh Boolean node messing up material assignments until that bug gets fixed.