* Zig apparently "limits stack overflow with a keyword"(!?)
    - How does this work?
    - Can it work across module boundaries?
    - Can it work well with versioning?
      (how much does it contrain changes of function implementations?)

* Nice to have operators / operator combinations:
    lo < x < hi             (useful for range checks)
    a = a ?? fallback       (available in many languages)
    a ||= fallback          (variant of the above. Used by crystal-lang)