inlineClassUnderlyingType

Type of the underlying property, if this class is inline.

As an optimization for metadata produced by the Kotlin compiler, this field is absent if the underlying property is public or protected. In that case, the intended way to load the underlying type of inline class is to find the property in KmClass.properties with the name inlineClassUnderlyingPropertyName that has no extension receiver or context parameters, and get its type.