I'm aware there's not always a ton of people comfortable reviewing changes to the v2 engine, but I would love anyone to break the ice on this one -- it's only

+38/-4

changed lines and fixes a weird inconsistency with

@rule

declarations: https://pantsbuild.slack.com/archives/C0D7TNJHL/p1567219387055000?thread_ts=1567122944.025300&cid=C0D7TNJHL