Roger Pate:
Simple, but you do point out in local-reaper's docs, "One cannot just apply this willy-nilly." :P
One can apply it to runsvdir. I checked. It waits for arbitrary children, and does not get confused by children that it did not spawn turning up.
Roger Pate:
(And how should we apply chain-loading local-reaper to runsv?)
How to wrap a program inside something else that does additional stuff then exec()s the original program *is* a solved problem on Unices and Linux, you know. (-: