The checkBuilt argument to update.packages() currently defaults to
FALSE. This means that packages built and installed under R 3.6.2 will
not be updated by R 4.0.0, and leads to confusion (e.g.
https://stackoverflow.com/q/60356442/2554330, where tidyverse can't be
updated because some of its many dependencies haven't been updated).
The default should be TRUE, even though this will lead to some packages
being updated unnecessarily, because the cost of an unnecessary update
is so much less than the cost of missing a necessary update.
Duncan Murdoch
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