convert

# File activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb, line 7
      def convert
        precision = options.delete :precision

        if precision
          case number
          when Float, String
            @number = BigDecimal(number.to_s)
          when Rational
            @number = BigDecimal(number, digit_count(number.to_i) + precision)
          else
            @number = number.to_d
          end

          if options.delete(:significant) && precision > 0
            digits, rounded_number = digits_and_rounded_number(precision)
            precision -= digits
            precision = 0 if precision < 0 # don't let it be negative
          else
            rounded_number = number.round(precision)
            rounded_number = rounded_number.to_i if precision == 0 && rounded_number.finite?
            rounded_number = rounded_number.abs if rounded_number.zero? # prevent showing negative zeros
          end

          formatted_string =
            if BigDecimal === rounded_number && rounded_number.finite?
              s = rounded_number.to_s('F')
              s << '0'.freeze * precision
              a, b = s.split('.'.freeze, 2)
              a << '.'.freeze
              a << b[0, precision]
            else
              "%00.#{precision}f" % rounded_number
            end
        else
          formatted_string = number
        end

        delimited_number = NumberToDelimitedConverter.convert(formatted_string, options)
        format_number(delimited_number)
      end