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The change to the internal table in R 4.0.4 for ‘iswprint’ has been reverted: it contained some errors in printability of ‘East Asian’ characters.
New function ‘charClass()’ in package ‘utils’ to query the wide-character classification functiions in use (such as ‘iswprint’).
(Not Windows.) ‘l10n_info()’ reports an additional element, the name of the encoding as reported by the OS (which may differ from the encodoing part (if any) of the result from ‘Sys.getlocale("LC_CTYPE")’.