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A general description is here.
Long stringed error messages are now protected from premature garbage collection, fixing PR#19210, reported and analyzed by Yuancheng Jiang.
‘ksmooth(x,y, x.points=NULL)’ now returns an empty (x,y) pair instead of crashing R, fixing PR#19153.
Additionally, also by Adam Berkeš, ‘x <- rep(999,0); ksmooth(x, x, x.points = 1)’ no longer writes out of bounds, fixing PR#19171. Ditto for ‘ksmooth(x, x, n.points = 0)’, PR#19219.
‘wilcox.test(x, exact=FALSE, correct = k)’'s p-value computation got a missing ‘dnorm(z)’ factor, and so did the 2-sample case, in addition to more fixes.
Further, if ‘wilcox.test(.., exact=TRUE)’'s p-value is close to the 0 or 1 boundaries, the calculation no longer suffers severely from cancellation, thanks to Tasuku Kobayashi's reports and Ahmed Sattar Jabbar's suggestion in PR#19144.