I'm not sure it's a thing to be advanced past. Using a language to implement a given pure function is inherent to deploying it. You could develop one universal

I'm not sure it's a thing to be advanced past. Using a language to implement a given pure function is inherent to deploying it. You could develop one universal way to create and deploy functions to different languages, but now you've introduced one more language to get people to use. And in practical terms, migrating this sort of thing from one language to another when necessary is generally a good enough solution.