Previously it was like "null cannot be cast to MyObject" or
"MyObject cannot be cast to null", because `KClass.qualifiedName` is
`null` for local classes (including anonymous ones).
Use `KClass.toString()` instead, for both object actual dynamic type
and cast target type. This string representation is generally more
meaningful for such cases, and contains useful details for local
classes.
Svyatoslav Scherbina