[klodolph]

Maybe what I read here is “this is how contributions go”…

Get the API right first. Make sure it’s correct, safe, and useful. Iterate on the performance afterwards.

IMO, a lot of contributions should take this shape.

[kcsrk]

It is often hard to see the shape of these things before a serious PR attempt is made. Each of the PRs reveals more of the shape of the problem being solved. Hard to skip them in practice, especially for new contributors.