class ActiveSupport::NumberHelper::NumberToRoundedConverter

def format_number(number)
  if strip_insignificant_zeros
    escaped_separator = Regexp.escape(options[:separator])
    number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, "")
  else
    number
  end
end