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I’ve been trying to find a way to perform validation on inline classes. The language designers really don’t want to allow this, as it would make Java interop unsafe in some circumstances.
If you have a pure Kotlin codebase that’s a shame. So I present a hack to get validated inline tiny types in Kotlin.
<http://oneeyedmen.com/inline-tiny-types.html>

We're going to support init blocks in inline classes soon, see <https://youtrack.jetbrains.com/issue/KT-28055>

Some discussion on other techniques at <https://www.reddit.com/r/Kotlin/comments/jzevz4/inline_tiny_types_with_validation/>