# File lib/backports/1.9.1/float.rb, line 3 def round_with_digits(ndigits=0) ndigits = Backports::coerce_to_int(ndigits) case when ndigits.zero? round_without_digits when ndigits < 0 p = 10 ** -ndigits p > abs ? 0 : (self / p).round * p else p = 10 ** ndigits prod = self * p prod.infinite? ? self : prod.round.fdiv(p) end end