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The calculation of the Spearman p-value in cor.test() is slightly more accurate in some cases. (PR#13574)
The digamma(), trigamma() and psigamma() functions could be inaccurate for value of x around 1e-15 due to cancellation. (PR#13714).
Calling setWinProgressBar() on a closed bar gives an error message, rather than crashing R. (PR#13709)
sprintf("%a") works better in some cases thanks to a patch to trio from Ei-ji Nakama.