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New function ‘pow1p(x,y)’ for accurate ‘(1+x)^y’.
‘dgeom()’ is more accurate now, notably when its result is very small, fixing PR#18642 thanks to the proposal of Morten Welinder, also improving other instances where C level ‘binom_raw(x, n, ..)’ has ‘x == 0’ or ‘x== n’.