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‘prettyNum(*, zero.print={>=1-char}, replace.zero=TRUE)’ now works as documented, thanks to Marttila Mikko and Ivan Krylov's messages on R-devel.
‘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..