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A general description is here.
‘sum()’ for integer arguments now uses an integer accumulator of at least 64 bits and so will be more accurate in the very rare case that a cumulative sum exceeds 2^53 (necessarily summing more than 4 million elements).
Methods invoked by ‘NextMethod()’ had different dynamic parent to the generic. This was causing trouble where S3 methods invoked via lazy evaluation could lose track of their generic (PR#15267).
Code for the negative binomial distribution now treats the case ‘size == 0’ as a one-point distribution at zero.
The minimum version for a system ‘xz’ library is now 5.0.3 (was 4.999). This is in part to avoid 5.0.2, which can compress in ways other versions cannot decompress.
‘is.unsorted(NA)’ returns false as documented (rather than ‘NA’).