Andrew Kelley is one of my all-time favorite technical speakers, and zig is packed full of great ideas. He also seems to be a great model of an open source project leader.

I would say zig is not just packed full of great ideas, there's a whole graveyard of ideas that were thrown out (and a universe of ideas that were rejected out of hand). Zig is full of great ideas that compose well together.

One that was tossed in 0.15 was `usingnamespace` which was a bit rough to refactor away from.