[torarnv]

As far as I know, splitting the series into individual PRs only works if you have commit rights to the repository, so you can base one PR on a different branch (in the main repository) than main.

As an outside contributor, with a fork of the repository, your three PRs will incrementally contain change A, A+B, and A+B+C, making the review of the last two PRs harder, because you need to review diffs for code you're already reviewed in another PR.

[meling]

Not sure about the fork workflow but otherwise it is possible to change the base branch (manually on GH’s web interface) so that you don’t have to see the original branches and review the changes from A to B and from B to C. Maybe this is not possible with fork workflows?