The restore key for caches in setup-r-dependencies uses R.Version()$version.string.
For, R-devel, it is something like
[1] "R Under development (unstable) (2021-11-08 r81154)"
Therefore, the cache becomes invalid once a new version of R-devel is pushed. I am not sure if it is intended though. The original method of using
> sprintf("R-%i.%i", getRversion()$major, getRversion()$minor)
[1] "R-4.2"
works better for R-devel and preserves the cache for longer period of time.
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