# File lib/backports/1.9.1/integer/round.rb, line 6 def round_with_digits(ndigits=0) ndigits = Backports::coerce_to_int(ndigits) case when ndigits.zero? self when ndigits > 0 raise RangeError if ndigits >= 1<<31 Float(self) else pow = 10 ** (-ndigits) return 0 if pow.is_a?(Float) # when ndigits hugely negative remain = self % pow comp = self < 0 ? :<= : :< remain -= pow unless remain.send(comp, pow / 2) self - remain end end