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kotlinlang

Hello,
How do I make use of mockk to mock or spy an object with a nullable Duration field. I am getting
```Suppressed: java.lang.ClassCastException: class java.lang.Long cannot be cast to class kotlin.time.Duration (java.lang.Long is in module java.base of loader 'bootstrap'; kotlin.time.Duration is in unnamed module of loader 'app')```

I see that my issue is similar to this but there is no solution there
<https://github.com/mockk/mockk/issues/869>