i would like to be able to not trust that filesystem events occur in any particular order, i.e. if watchman sends a spurious notification i'd like to be ok with that. in the above case, i feel like idempotent (or at least very quickly converging) formatters are something we can try to have though? i don't necessary like the idea of the double-check you're describing, but i'm not sure i can see an alternative that would do something to stop the watchman event that i like.