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kotlinlang

Yes, it's just a representation you can't actually declare intersection types like that yourself.

Thanks. And this will only allow boolean and Int in this case? Or does it include anything else?

so both would work on their own for  that array?

Err well it's complicated, in this case any class that is serializable and implements `Comparable&lt;Any&gt;` (which does't actually make sense) will work I think.

Not sure what options you're talking about?

like only using Array&lt;java.io.Serializable&gt;

it seems then I can add more types to the array

You can disable these type hints of define type aliases for more complex types to make them look nicer