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‘fourfoldplot()’ could encounter integer overflow when calculating odds ratio. (PR#17286)
‘aggregate(<data.frame>, drop=FALSE)’ now also works in case of near-equal numbers in ‘by’. (PR#16918)
‘factor()’ now uses ‘order()’ to sort its levels, not ‘sort.list()’.
This makes ‘factor()’ support custom vector-like objects if methods for
the appropriate generics are defined. This change has the side effect
of making ‘factor()’ succeed on empty or length-one non-atomic
vector(-like) types (e.g., list), where it failed before.