XML - Implied Attribute Access Not Working In Royale

[yishayw]

In Flex

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                width="100%"
                height="100%"
                creationComplete="init()"
                xmlns:s="library://ns.adobe.com/flex/spark"
                xmlns:mx="library://ns.adobe.com/flex/mx">
    <fx:Script>
        <![CDATA[

            private function init():void
            {
                var myXml:XML = <node a="1"/>;
                myXml.attribute("a")[0] = "2";
                trace(myXml.toXMLString());
            }

        ]]>
    </fx:Script>
</mx:Application>

Traces

<node a="2"/>

But in Royale

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                width="100%"
                height="100%"
                creationComplete="init()"
                xmlns:js="library://ns.apache.org/royale/basic"
                xmlns:mx="library://ns.apache.org/royale/mx">
    <fx:Script>
        <![CDATA[

            private function init():void
            {
                var myXml:XML = <node a="1"/>;
                myXml.attribute("a")[0] = "2";
                trace(myXml.toXMLString());
            }

        ]]>
    </fx:Script>
</mx:Application>

Outputs

<node a="1"/>