fwiw, i've been continuing to look at https://github.com/pantsbuild/pants/pull/8181 (the

@dataclass

for engine params PR), and just rebased it after the mypy-type

@rule

parameters change john merged yesterday, and there's consistently this one very confusing what-looks-like-a-flake-but-is-happening-reliably in CI -- will try to nail that down today but no promises until i get more time this weekend