I could really use unsigned types (parsing a binary format)… how sane is it to adopt unsigned types at their current maturity? Are they experimental like coroutines (works great, but api changes may come) or experimental like running a prerelease jvm (all hell may break loose, etc)?

coroutines are not experimental 🤔 I think unsigned types are as stable as inline classes are in general. There are some issues when it comes to serialization, reflection and some rare compiler exceptions. Depends on your context. I love working with experimental stuff. Some extra effort but usually worth it 🙂

coroutines were experimental 🙂