「イミテーション」の意味とは？その使い方や背景に隠された本当の意味を解説 @MarkusMeskanen: since the item is immutable, and if you mutated it in position you could not specialise it in the subclass. This was spotted by Khushal Bherwani who posted an case in point on X, I am in a position to replicate it, here is my GIF of it https://atsprojectnoidaextension.blogspot.com