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A general description is here.
‘sprintf’ now warns on arguments unused by the format string.
The R installer can now be optionally built to support a single architecture (only 64-bit or only 32-bit).
R is more careful when truncating UTF-8 and other multi-byte strings that are too long to be printed, passed to the system or libraries or placed into an internal buffer. Truncation will no longer produce incomplete multibyte characters.
‘mclapply’ and ‘pvec’ no longer accidentally terminate parallel processes started before by ‘mcparallel’ or related calls in package ‘parallel’ (PR#18078).
‘grep’ and other functions for evaluating (extended) regular expressions handle in Unicode also strings not explicitly flagged UTF-8, but flagged native when running in UTF-8 locale.
Fixed a crash in ‘fifo’ implementation on Windows (PR#18031).
Binary mode in ‘fifo’ on Windows is now properly detected from argument ‘open’ (PR#15600, PR#18031).