I'm sorry what? Crystal's type system is both expressive and safe compared to most languages. It has generics, tagged type unions and dynamic dispatch. It has

I'm sorry what? Crystal's type system is both expressive and safe compared to most languages. It has generics, tagged type unions and dynamic dispatch. It has a built in spec runner and testing suite which are highly usable and proven on the compiler. Most of all, it is already concurrent. Crystal has lightweight fibers implemented in assembly for x86, arm and arm64. It has channels to communicate between fibers. All io is evented by default, where the http server manages over 100,000 requests per second per core. Its obvious to me you don't know what you're talking about.