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(Windows mainly) High Unicode code points which require surrogate pairs are now handled. All systems should properly handle surrogate pairs, even those systems that don't need to make use of them. (PR#16098)
(Windows only) The ‘choose.files()’ function could return incorrect results when called with ‘multi = FALSE’. (PR#17270)
Vignettes listed in ‘.Rbuildignore’ were not being ignored properly. (PR#17246)