[AS3] Vector.<*> as argument

gistfile1.as

var v:Vector.<Sprite> = new Vector.<Sprite>();
trace(v is Vector.<*>);// true
var foo:Vector.<*>;
//foo = v;// Implicit coercion of a value of type __AS3__.vec:Vector.<flash.display:Sprite> to an unrelated type __AS3__.vec:Vector.<*>.
foo = v as Vector.<*>; // OK
var bar:Vector.<Sprite> = foo as Vector.<Sprite>;// OK

genericArgument(v);// true, 0, Hello from genericArgument()
//typedArgument(v);// Implicit coercion of a value of type __AS3__.vec:Vector.<flash.display:Sprite> to an unrelated type __AS3__.vec:Vector.<*>.
 
function genericArgument(value:*):void
{
	var foo:Vector.<*> = value as Vector.<*>;
	trace(foo is Vector.<*>, foo.length); // true, 0
	trace("Hello from genericArgument()");
}
 
function typedArgument(value:Vector.<*>):void
{
	trace("You won't see this message");
}

This seems to work for Vector. but not Vector.. I guess primitive types don't work...