Do you know of a language that supports interface versioning? I often wished for one (as I like writing programs by "iterative refining", where I basically copy the good parts into a completely new project), but have never heard of a language that does something like that.
Sadly, I do not. You can emulate it pretty well with just putting numbers on the end of function names though. I'm always a little shocked at how the people who make programming languages seem to consistently ignore some of the most obvious features in favour of weird stuff.
