// direct use of the class, should be Publisher
    public void method1(Flowable<?> f)
// lambda returns the class, should return a Publisher
    public void method2(Callable<Flowable<?>> c)
// The inner Publisher emits the class, should emit Publisher
    public void method3(Supplier<Publisher<Flowable<?>>> c)
// Direct use of the class as array type, should be Publisher[]
    public void method4(Flowable<?>[] array)
// Lambda returns an array of the class, should return Publisher[]
    public void method5(Callable<Flowable<?>[]> c)
// The inner Publisher emits an array of the class, should emit Publisher[]
    public void method6(Callable<Publisher<Flowable<?>[]>> c)