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‘signif(1.**e308, digits)’ no longer truncates unnecessarily (but still to prevent overflow to ‘Inf’), fixing PR#18889.
‘pbeta(x, a,b, ..)’ for very large ‘a,b’ no longer returns ‘NaN’ but the correct values (0 or 1, or their logs for ‘log.p = TRUE’). This improves Mathlib's C level ‘bratio()’ and hence also ‘pnbinom()’, etc..