Use io.github.mackimaow:kotlin-union for unions

[mackimaow]

⭐ Suggestion

I made a nice alternative handling external union types with type checking rather than using dynamic (which is not type safe).

I believe that dukat can obtain enough information to generate the union cases (specified in the kotlin-union repository)
It would be nice to have all instances of where union is required to be replaced with Union<...> from kotlin-union.

The readme of the repository explains the subtleties of the usage of the Union type.

📚 Additional Information

Kotlin Union Repo