> Use subtyping in Julia and enums in Rust. One caveat though: Enums can not be extended from the “outside”. If you plan to let users of your library add new ty

> Use subtyping in Julia and enums in Rust. One caveat though: Enums can not be extended from the “outside”. If you plan to let users of your library add new type variants, you will have to use some kind of trait approach. This extensibility from the outside is the most important idea behind Julia! For example this is why a generic deep learning library doesn't need any extra implementation details to be able to run on GPU as well. https://fluxml.ai/Flux.jl/stable/gpu/ https://fluxml.ai/Flux.jl/stable/gpu/