「イミテーション」→ 本物の真似、または模倣品。ややネガティブな意味が含まれることがある。 @MarkusMeskanen: since the item is immutable, and if you mutated it in position you may not specialise it inside a subclass. One more factor you could possibly look at, in case you are unable to switch the original sort, is extending the sort like so: And one particular https://officespacenoidacentral.blogspot.com