Bug in array behavior when passing from JSNI to included script

[Erem]

Hey guys,

I observed some unexplainable behavior in GWTTestCase today. Has
anyone else seen this? If not I'll go ahead and file an issue.

The problem:
Any GWT/JSNI-created Javascript Array that I pass to functions defined
in an external .js library will return FALSE for "instanceof Array".

I'm attaching a test case that reproduces the error, along with the
module.xml in question and the external script necessary to run the
tests.

=========== com/testarrays/TestArrays.gwt.xml ================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.0.3//
EN" "http://google-web-toolkit.googlecode.com/svn/tags/2.0.3/distro-
source/core/src/gwt-module.dtd">
<module>
        <inherits name="com.google.gwt.user.User" />

        <!-- Include dependent packaged .js lib -->
        <public path="client" />
        <script src="testArrays.js" />

        <!-- Paths for translatable java code -->
        <source path='client'/>
</module>

=========== com/testarrays/client/testArrays.js
===================
var TestArrays = {}

TestArrays.isAnArray = function(inArray) {
    return (inArray instanceof Array)
}

TestArrays.myArraysAreArrays = function() {
        return (["a", "b", "c"] instanceof Array)
}

=========== com.testarrays.client.TestArrays.java ===================
package com.testarrays.client;

import com.google.gwt.junit.client.GWTTestCase;

public class TestArrays extends GWTTestCase {

        /*
         * Arrays passed to functions in external script are not recognized
         * as arrays!
         */
        public void testArraysAreRecognizableInExternalJavascript() {
                //fails
                assertTrue(arrayPassedToExternalFileIsAnArray());
        }
        final native boolean arrayPassedToExternalFileIsAnArray() /*-{
                return $wnd.TestArrays.isAnArray(["a", "b", "c"])
        }-*/;

        /*
         * But pure GWT JSNI recognizes arrays just fine
         */
        public void testArraysAreArraysInPureJSNI() {
                assertTrue(arrayInPureJSNIIsAnArray());
        }
        final native boolean arrayInPureJSNIIsAnArray() /*-{
                return (["a", "b", "c"] instanceof Array)
        }-*/;


        /*
         * Most logic within the external file works.
         */
        public void testExternalFileIsImportedCorrectly() {
                assertTrue(externalFileIsImportedCorrectly());
        }
        final native boolean externalFileIsImportedCorrectly() /*-{
                return $wnd.TestArrays.myArraysAreArrays()
        }-*/;


        /*
         * Even manually attaching a method to a $wnd doesn't yield the
         * problem from the first test!
         */
        public void testArraysInJsniMethodsWorkFine() {
                assertTrue(arrayInJSNIMethodIsAnArray());
        }
        final native boolean arrayInJSNIMethodIsAnArray() /*-{
                $wnd.InternalTest = {}

                $wnd.InternalTest.isAnArray = function(inArray) {
                        return (inArray instanceof Array)
                }

                return $wnd.InternalTest.isAnArray(["a", "b", "c"])
        }-*/;

        @Override
        public String getModuleName() {
                return "com.testarrays.TestArrays";
        }
}

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