Yes, there have been lots of discussions about this — typically referred to as "formal interfaces." This would be a 2.0 (or later) feature addition, and it's no

Yes, there have been lots of discussions about this — typically referred to as "formal interfaces." This would be a 2.0 (or later) feature addition, and it's not yet certain how it would be approached. https://github.com/JuliaLang/julia/issues/6975 https://github.com/JuliaLang/julia/issues/6975 https://github.com/JuliaLang/julia/issues/5 https://github.com/JuliaLang/julia/issues/5