[josefx]

> What language lets you ship scripts that use features of version X and also works on versions <X?

I didn't care about Python 3 features, but you can't run Python 2 code on a Python 3 interpreter either and the Python 2 interpreter was abandoned. Meanwhile you can run ancient JavaScript code on both old and modern systems, ancient C++ on both old and modern systems, ancient Java mostly on both old and modern systems, etc. .

> Docker tends to be the easy solution for all this stuff, and it's language agnostic.

I think I will rather go with statically linked binaries before I dump docker on unsuspecting users. Just the pain of getting that dependency whitelisted by their corporate IT makes my skin crawl.