Enum based on Int64 causes dex error in Android Studio

Just another little glitch that cost us some time to find, so I thought I would log. This code compiles fine in Fire, in an Android library, but causes the Android Studio compile process to choke. If you replace the :Int64 on the enum with :Int, order is restored.
(The developer chose Int64 as it was modelling a binary field that size)

public enum SomeEnum: Int64
{
	case x 
	case y
}

public class SomeClass
{
	public init(someEnum: SomeEnum)
	{
	}
}

causes

Thanks, logged as bugs://73871

This is an interesting one. It has zero details, will try to find out why it gives that errors.

bugs://73871 got closed with status fixed.

Unfortunately this has no real workaround (other than changing to Int32), fixed for fridays beta though.