When a package's attrpath is renamed it is currently treated as a rebuild, even though the outpath already exists and is already cached. This also happens when adding new names for packagesets that already exist, for example when starting to eval `perlPackages` in CI, which is just the same as `perl540Packages` currently. It would also happen when `perlPackages` is switched from `perl540Packages` to `perl999Packages`. Assuming that `perl999Packages` had already been built before, this doesn't really cause any rebuilds.
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