# File lib/action_view/helpers/number_helper.rb, line 251
      def number_to_human_size(number, *args)
        return number.nil? ? nil : pluralize(number.to_i, "Byte") if number.to_i < 1024

        options = args.extract_options!
        options.symbolize_keys!

        defaults = I18n.translate('number.format''number.format', :locale => options[:locale], :raise => true) rescue {}
        human    = I18n.translate('number.human.format''number.human.format', :locale => options[:locale], :raise => true) rescue {}
        defaults = defaults.merge(human)

        unless args.empty?
          ActiveSupport::Deprecation.warn('number_to_human_size takes an option hash ' +
            'instead of a separate precision argument.', caller)
          precision = args[0] || defaults[:precision]
        end

        precision ||= (options[:precision] || defaults[:precision])
        separator ||= (options[:separator] || defaults[:separator])
        delimiter ||= (options[:delimiter] || defaults[:delimiter])

        max_exp  = STORAGE_UNITS.size - 1
        number   = Float(number)
        exponent = (Math.log(number) / Math.log(1024)).to_i # Convert to base 1024
        exponent = max_exp if exponent > max_exp # we need this to avoid overflow for the highest unit
        number  /= 1024 ** exponent
        unit     = STORAGE_UNITS[exponent]

        begin
          escaped_separator = Regexp.escape(separator)
          number_with_precision(number,
            :precision => precision,
            :separator => separator,
            :delimiter => delimiter
          ).sub(/(\d)(#{escaped_separator}[1-9]*)?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '') + " #{unit}"
        rescue
          number
        end
      end