alt Hacker NewsRich Errors look promising to me, but what about interop with Java? What will the return-type of a function be on the Java side be, if the return type on Kotlin side is: Int | ParseError | SomeOtherError?
Background: unions aren't restricted to one normal type and one error type, but to one normal type and any number of error types, so this can't be modelled as syntactic sugar on top of an implicit Either/Result type, can it??
Replies
pianoben • today at 6:23 PM
> what about interop with Java?
From the proposal discussion[0], the runtime representation on the JVM will just be `Object`.
[0]: https://github.com/Kotlin/KEEP/discussions/447#discussioncom...
Kotlin folks seem to mostly care about Java as bootstrap to their own ecosystem.
The anti-Java bias, against the platform that made it possible in first place and got JetBrains a business, is quite strong on Android, fostered by the team own attitude usually using legacy Java samples vs Kotlin.