Feature request: type annotations

[mscofield0]

Type annotations would be ideal, but I don't see it implemented yet in Rune. If there are comments, I could always do /*: Type*/, but uh, yuck.

[udoprog]

Related: #23, #633

[udoprog]

The intent is to move towards a gradual typing system, where types can be required at compile time if needed. If type annotations are present and enforced, that could also lead to new forms of optimization.