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: Since the object is immutable, and if you mutated it set up you may not specialise it inside of a subclass. エゴとは？意味・心理学的解釈・使い方・類語・実生活での影響を徹底解説 The right resolve is to incorporate the property in the kind definition as discussed in @Nitzan Tomer's solution. If that's no... https://villassaleyamunaexpressway.blogspot.com