Kotlin interop failue

sample.java

//////////////// java base class
public final class GenericInterop {

  public interface BaseChanger<From, To> {

    Base<To> change(Base<From> from);
  }

  public static class Base<T> {

    public final <R> Base<R> compose(BaseChanger<? super T, ? extends R> changer) {
      //noinspection unchecked
      BaseChanger<T, R> casted = (BaseChanger<T, R>) changer;
      return casted.change(this);
    }
  }
}

///////////// java knows type diamonds:
public GenericInterop.Base<String> transform(GenericInterop.Base<Integer> intBase) {
  return intBase.compose(from -> new GenericInterop.Base<>());
}
  
  
/////////// kotlin doesnt know type, need to specify <String>
fun transform(intBase: GenericInterop.Base<Int>): GenericInterop.Base<String> {
  return intBase.compose { GenericInterop.Base<String>() }
}