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A general description is here.
‘paste()’ and ‘paste0()’ get new optional argument ‘recycle0 = FALSE’. When set to true, zero length arguments (and all zero-length or no arguments when ‘collapse’ is not ‘NULL’) lead to the zero-length ‘character(0)’.
‘x[[Inf]]’ (returning ‘NULL’) no longer leads to undefined behavior, thanks to a report by Kirill Müller in PR#17756. Further, ‘x[[-Inf]]’ and ‘x[[-n]]’ now give more helpful error messages.
‘data(package = "P")’ for ‘P’ in ‘base’ and ‘stats’ no longer reports the data sets from package ‘datasets’ (which it did for back compatibility for 16 years), fixing PR#17730.