How to properly extend (inherit) a data class in Kotlin? Possible workarounds

Hi everyone! I just started learning Kotlin and encountered an unexpected problem. I need to create a class hierarchy for modeling entities in an application. For example, there is a base class `User` with fields `id` and `email`, and I want to create a data class `AdminUser` from it that adds a `role` field. I wrote this code: ```kotlin data class User(val id: Long, val email: String) data class AdminUser(val id: Long, val email: String, val role: String) : User(id, email) ``` But the compiler gives an error: "data class may not inherit from a data class". I googled it and realized that a data class in Kotlin cannot inherit from another data class because the compiler cannot generate correct `equals()`, `hashCode()`, `toString()`, and `copy()` methods for such a hierarchy. But what should I do?