Agree with everything here. I posted an example [1] of how this can be solved now with C# (although in reality it just adds another 'equality solution' to the

Agree with everything here. I posted an example [1] of how this can be solved now with C# (although in reality it just adds another 'equality solution' to the mix). It uses ad-hoc polymorphism to implement a type-class (interface) and instance (struct) approach, similar to Haskell. There's no IEqualityComparer instance allocation cost either. [1] https://news.ycombinator.com/item?id=12954790 https://news.ycombinator.com/item?id=12954790