There are a few expected (or, better said, rumored) features that have been left out. Some of them will eventually come (views), some of them probably don't (like using the unicode symbol for sqrt). I was surprised when I saw in nsl a shift-reduce parser that took into account operator precedence, but it looks like it is not being used. I'd like to have lexical scoping too, but due to how function values work, I see it very unlikely.