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A general description is here.
‘lgamma(x)’ for very small ‘x’ (in the denormalized range) is no longer ‘Inf’ with a warning.
‘beta(a, b)’ could overflow in its calculations when at least one of ‘a’ and ‘b’ was less than one. (PR#15075)
‘lbeta(a, b)’ no longer gives ‘NaN’ if ‘a’ or ‘b’ is very small (in the denormalized range).
‘R_SVN_REVISION’ in ‘Rversion.h’ is now an integer and hence usable as e.g. ‘#if R_SVN_REVSION < 70000’.