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A general description is here.
The default version for ‘save()’, ‘saveRDS()’, ‘serialize()’ and
similar has been changed to ‘3’. Objects saved with version 3 are not
readable by earlier versions of R.
This includes saved workspaces.
By default, packages are now byte-compiled on installation.
By default, packages are now byte-compiled on installation.
POSIXt objects can now also be rounded or truncated to month or year.
‘stopIfnot()’ is a new alternative to ‘stopifnot()’, nicer to use when testing several expressions in one call.