Language Design: Equality & Identity – Part 2: Problems

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Containment The core issue is that equality on its own is insufficient to implement some, rather mundane, algorithms. Asking the simple question “is some element contained in this data structure” in different languages demonstrates the problem: Java: List.of(Float.NaN).contains(Float.NaN); // true JavaScript: [NaN].includes(NaN) // true Rust: &[0.0/0.0].contains(0.0/0.0) // false C#:…

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