def inspect
      title + list.map do |ptr|
        next "(#{ptr})\n" if ptr.is_a?(Symbol)
        next " => (nil)\n" if ptr.nil?

        format(' => %s', Helper.color(format('%#x', ptr)))
      end.join
    end
def inspect
      title + list.map do |ptr|
        next "(#{ptr})\n" if ptr.is_a?(Symbol)
        next " => (nil)\n" if ptr.nil?

        format(' => %s', Helper.color(format('%#x', ptr)))
      end.join
    end
Pretty inspect.
 @return [String] fastbin layouts wrapper with color codes.