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Making refman.pdf works around a problem with the indexing with hyperref 6.79fd and later.
qchisq(p, df, ncp, lower.tail = FALSE) with ncp >= 80 was inaccurate for small p (as the help page said): it is now less inaccurate. (In part, PR#13999.)
For ncp less than but close to 80, pchisq() and qchisq() are more accurate for probablilities very close to 1 (a series expansion was truncated slightly too early).
pchisq(x, df, ncp) can no longer can return values just larger than one for large values of ncp.
unsplit(drop = TRUE) applied to a data frame failed to pass 'drop' to the computation of row names. (PR#14084)