Donald, what do you think? IIRC, you were most keen on going
sdist->wheel where possible, and I don't think you've commented on
Paul's suggestion yet (apologies if I've overlooked a response).

I still think it should, and prefer pip to attempt to build a sdist prior to building a wheel when we’re coming from a VCS directory. I think that is going to be the most robust mechanism with the least amount of surprising behavior for end users.