It's syntactically Go but it adds a functional DSL on top of it - that is, you can't just know Go, you need to learn the ins and outs of this library too (plus functional programming) before you can use it.

I cannot recommend this unless you really have to for whatever reason. Besides readability, another factor to consider is performance; Go is not optimized for functional programming structures. It doesn't have things like tail call optimization.

There's better languages than Go if you want to / have to do functional programming.