ArrayCollection - comparison of item to null emits setProperty()

[yishayw]

Test case:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                   xmlns:mx="library://ns.apache.org/royale/mx"
		   applicationComplete="init()"
                   width="600" height="400" >

			<fx:Script>
				<![CDATA[
					import mx.collections.ArrayCollection;

					private function init():void
					{
						var myDp:ArrayCollection = new ArrayCollection();
						myDp.addItem("hello1");
						if (myDp[0] != null) // bad line
						{
							trace("ok...")
						} else
						{
							trace("not ok")
						}
					}

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

The line commented with //bad transpiles to:

if (myDp.setProperty(0, null)) {

which yields a 'not ok' result.

[yishayw]

Workaround is to replace //bad line with

						var item1:Object = myDp[0];
						if (item1 != null)