For packages whose 'repo' field in 'required-packages' is CRAN or GRAN, the newly installed package will be the most current one, not the precise version specified in the 'version' field. For packages whose 'repo' is github, the package will be installed from the specified 'ref'.
package statuses that should cause that package to be reinstalled. The default is recommended, but "newer" is a sometimes-reasonable additional option, and "perfect" is technically also an option (if you want to reinstall everything no matter what).
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