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It has typeclasses! Well...it has *some* typeclasses. Some better than none, right? Three. Hardcoded. Uh

Rust is pretty much there too but somehow _it_ gets a pass from criticism.

Rust is a far more extensible, growable lang than Elm and Go, so you get much more mileage from the tools it gives you.

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That said, the abstraction ceiling is still there though, and can be frustrating at times when you keep bouncing off it like a balloon… 🎈😭

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and

Outside of metaprogramming how is it growable or extensible?

Parametric & bounded polymorphism, ADTs, macros, escaping into unsafe for making primitives (Vec, Box, Rc, etc are libraries, not built-ins)

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