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Adding commits as I check off the items in #15.Split off #22 and #23 from #15. Moving away from WIP PRs (i.e. those that are "ready for review but will be added to and then need to be re-reviewed") in favor of self-contained PRs that usually don't need to be re-reviewed - or, in the case of "I want some feedback on code that's not ready to be merged yet", a clear label that indicates the purpose of the PR.
Basically I realized that, once someone approves a PR, there's no way to see whether they've also read and approved any commits that land after their approval. (There is a setting on the repo that resets approvals on push, but I don't want to make reviewers come back just for e.g. typo fixes.)
Closes #15.