I like the emphasis this article places on testing. Languages which emphasise testing or make testing easy are my favourites to code in. For example, JS being d

I like the emphasis this article places on testing. Languages which emphasise testing or make testing easy are my favourites to code in. For example, JS being dynamic and having mature testing and assertion libraries lowers the barrier to getting stuff tested, Go has testing in its standard library, and Rust has amazing support for tests (including testing examples in comments) both in the language and from Cargo. Perhaps it is more important to provide tooling and libraries for testing a language than it is to provide new features in the language proper to avoid foot-guns. It's much harder to back out of the latter.