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Improve the large-n efficiency of ‘as.matrix(<dist>)’, thanks an R contributors effort, notably by Tim Taylor and Heather Turner, see PR#18660.
‘iconv(sub = "Unicode")’ now zero-pads to four (hex) digits, rather than to 4 or 8. (This seems to have become the convention once Unicode restricted the number of Unicode points to 2^21 - 1 and so will never need more than 6 digits.)