知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 @MarkusMeskanen: as the item is immutable, and when you mutated it in position you could potentially not specialise it in a very subclass. An additional factor you could take into account, should you be unable to switch the original sort, is extending the kind like so: In https://deendayaljanawasyojanapanipat.video.blog/