module Polyfill module V2_4 module Integer module Instance module Round module Method def round(ndigits = 0, half: nil) unless [nil, :down, :even, :up, 'down', 'even', 'up'].include?(half) raise ArgumentError, "invalid rounding mode: #{half}" end ndigits = ndigits.to_int return super() if ndigits == 0 return to_f if ndigits > 0 place = 10 ** -ndigits (self.to_f / place).round * place end end if RUBY_VERSION < '2.4.0' refine ::Integer do include Method end def self.included(base) base.include Method end end end end end end end