[hippyhippo]

> What's the secret sauce?

Lies.

On a more serious note, compilers and programming languages take years to get into a usable state, and V very much in early stages of development, pre-pre-pre-alpha or similar quality. It is far from usable for any serious work at all. All the listed features are "planned features", many of which are not yet implementd or buggy. In other words, as development progresses, the author of V will realize that it is not easy to design/implement those features properly, otherwise every language would have that.