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A general description is here.
‘options(scipen = NULL)’ and other invalid values now signal an error instead of invalidating ops relying on a finite integer value. Newly, values outside the range -9 .. 9999 are warned about and set to a respective boundary or to the default ‘0’, e.g., in case of an ‘NA’.
R can be installed using C23 (for example with ‘-std=gnu23’ or ‘-std=gnu2x’) with recent compilers including ‘gcc’ 14, Apple ‘clang’ 16 and LLVM ‘clang’ 17-19. (LLVM ‘clang’ 18 and 19 objected to apparently valid code using attributes accepted by all the other compilers.)