[gnl]

The font in the screenshots with the ligatures is in fact Fira Code and the font in the REPL screenshots without ligatures is Ubuntu Mono.

I guess those could be considered additional syntax, but they're also completely optional and interchangeable with the corresponding, more Clojure-like keywords.

[grzm]

Yeah, I wouldn't consider them syntax, either. There's a lot we can do to make our coding environments easier to work in, and that's independent of the source code itself. I'm glad to see more exploration in this space.