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‘filled.contour()’ gains ‘key.border’ argument.
‘tools::update_pkg_po()’ gets ‘pot_make’ and ‘mo_make’ options for _not_ re-making the corresponding files, and additionally option ‘verbose’.
‘diff()’ for objects of class ‘"Date"’, ‘"POSIXct"’, and ‘"POSIXlt"’ accepts a ‘units’ argument passed via ‘...’.
‘R CMD Rdiff’ gets option ‘--useEx’.
‘withAutoprint({ .. })’ now preserves ‘srcref’s previously lost, thanks to Andrew Simmons' report plus fix in PR#18572.