Repo for testing and demonstration of "opaque" issue
When issue.test.model#Whatever type is just ordinary type alias, code compiles. When this same type becomes opaque type, code compilation fails with:
We were unable to read your assertion at compile-time.
You must either define your assertion directly or refer to other inline definitions:
override inline def assertion = greaterThan(10) && lessThan(100).
or
inline def extracted = greaterThan(10) && lessThan(100).
override inline def assertion = extracted.
It fails for both CustomerId and CustomerName.
This behaviour seems to be exclusive for package objects.