问无法复制对象的深拷贝向量

EN

flash.net.registerClassAlias("tld.domain.package.Path_Tiles", Path_Tiles);

var tiles:Vector.<Path_Tiles>;
var tilesCloned:Vector.<Path_Tiles>;

var byteArray = new ByteArray();
byteArray.writeObject(tiles);
byteArray.position = 0;
tilesCloned = byteArray.readObject() as Vector.<Path_Tiles>;

package
{
public class Path_Tiles
{
    public function Path_Tiles(property1:String=null, property2:int=undefined) {
        this.property1 = property1;
        this.property2 = property2;
    }

    public var property1:String;
    public var property2:int;
}
}

package
{
import flash.display.Sprite;
import flash.net.registerClassAlias;
import flash.utils.ByteArray;

public class Main extends Sprite
{
    public function Main() {
        super();

        var source:Vector.<Path_Tiles> = new <Path_Tiles>[
            new Path_Tiles("Hello", 1),
            new Path_Tiles("World", 2)
        ];

        var cloned:Vector.<Path_Tiles> = clone(source);
    }

    public function clone(source:Vector.<Path_Tiles>):Vector.<Path_Tiles> {
        flash.net.registerClassAlias("Path_Tiles", Path_Tiles);
        var byteArray = new ByteArray();
        byteArray.writeObject(source);
        byteArray.position = 0;
        return byteArray.readObject() as Vector.<Path_Tiles>;
    }
}
}