What's the process for changing/updating tidyups?

[hadley]

trafficstars

• Do we need to version them somehow? (e.g. just do a version number in the doc metadata)
• Should they be immutable? (i.e. you propose a new tidyup that supersedes a previous)
• Feels like substantial changes should be proposed through a tidyup

[DavisVaughan]

I think I like the idea of only changing/updating a tidyup through a PR. A Revisions section at the bottom of the tidyup could link to each PR that changes something with a one-liner about the change, and the PR would describe the changes in more detail.

Immutable tidyups seem a little stiff to me. I doubt that I will ever get one right on the first try, so always creating a second tidyup that invalidates the first seems like a lot of noise.