> Use subtyping in Julia and enums in Rust. I would use enums in Julia, making the enum you define a field of the PlayerClass: @enum PlayerStar Sol Pol Cent

> Use subtyping in Julia and enums in Rust. I would use enums in Julia, making the enum you define a field of the PlayerClass: @enum PlayerStar Sol Pol Cent struct PlayerClass star::PlayerStar # other fields end Julia's compiler will split small unions into static dispatches behind branches, and can also decide whether or not to specialize on types or create a generic functions. But if your code is performance sensitive, I'm more comfortable controlling the behavior than relying on these optimizations. The problem is, dispatch is often a more convenient coding style than long branches.