- This avoids discrepancies between Standalone and IDE mode for sealed
inheritor tests with type aliases from libraries, because in
Standalone mode, libraries are deserialized with fully expanded types,
while in IDE mode, libraries are deserialized from stubs, where type
aliases are currently not expanded.
^KT-66013
- Inheriting from a sealed class in the wrong package is illegal, so a
library test makes no sense here, as the test infrastructure wouldn't
be able to compile the library.
^KT-66013
A type alias may still be inherited from. For example:
```
sealed class MyClass
typealias T = MyClass
class Inheritor : T() // `Inheritor` is a direct inheritor of `MyClass`.
```
The index is a simplified version of the IDE's
`KotlinTypeAliasByExpansionShortNameIndex`, but it should be sufficient
for virtually all cases.
^KT-66013
Marco Pennekamp