@JvmExposeBoxed annotation for opening API of inline classes to Java

[CommanderTvis]

No description provided.

[elizarov]

This document requires a lot more work to turn it into a finished design. We'll work offline on the list of required changes.

[k163377]

I did not see an issue, so let me comment directly.

How about allowing this annotation to be given to a single constructor or function as well?

I think there are only a limited number of situations where value class would be a problem.
Therefore, I feel that assigning value class on a per-class basis unnecessarily undermines the value of value class.

In addition, value class may not be defined or modified by the user.
Examples are unsigned integers and kotlin.time.Duration.