[hualaka]

? Commonly used for nullable types.

The tup is an interesting question. I often think about tup(int, bool, string) vs (int, bool, string). I convince myself that there might be a better choice.

`var t = (1 as i8, true, false)` Use automatic inference to replace active type declarations.

t.0 vs t[0] is equally difficult to choose, but t[0] is the more commonly used syntax. Using t[n] consistently across map/vec/set/tup might be the more correct decision.