Forcing elements of List to be converted as java.lang.Long

[Tim Fox]

Hello folks,

I have a Java method:
public void foo(List<Long> list) {
  System.out.println("elem0 is " + list.get(0));
}

Which I call from JS with a JS array:

obj.foo([123]);

This results in a ClassCastException as Nashorn converts the JS Array 
into a java.util.List instance which contains a java.lang.Integer 
element (not java.lang.Long)

Is there any way to force Nashorn to convert the array elements as Longs 
not Integers?

Thanks.