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A general description is here.
On platforms using ‘configure’ option ‘---with-internal-tzcode’, additional values ‘"internal"’ and (on macOS only) ‘"macOS"’ are accepted for the environment variable ‘TZDIR’.
On macOS, ‘"macOS"’ is used by default if the system timezone database is a newer version than that in the R installation.
The checking of the size of tarball in ‘R CMD check --as-cran <pkg>’ may be tweaked via the new environment variable ‘_R_CHECK_CRAN_INCOMING_TARBALL_THRESHOLD_’, as suggested in PR#17777 by Jan Gorecki.
Graphics devices can now specify ‘canClip = NA_LOGICAL’, in which case the graphics engine will never perform any clipping of output itself.
The clipping that the graphics engine does perform (for both ‘canClip = TRUE’ and ‘canClip = FALSE’) has been improved to avoid producing unnecessary artifacts in clipped output.
The ‘format()’ method for class ‘"ftable"’ gets a new option ‘justify’; suggested by Thomas Soeiro.
When printing list arrays, classed objects are now shown _via_ their ‘format()’ value if this is a short enough character string, or by giving the first elements of their class vector and their length.
Unicode character width tables (as used by ‘nchar(, type="w")’) have been updated to Unicode 12.1 by Brodie Gaslam (PR#17781).