jQuery Safari Bug

HTML

<div id="page">
    <h3>Output of device[type="zone"]</h3>
    <div id="output1"></div>
    
    <h3>Output of device[type="zone"] using $.unique()</h3>
    <div id="output2"></div>
</div>

JavaScript

var xmlconfig = $.parseXML(getxml());

// build html for output1
var zones = $(xmlconfig).find('device[type="zone"]');
var length = $(zones).length;
var html = "<h4>Zone Count = " + length + "</h4><ul>";
$(zones).each(function () {
    var id = $(this).attr("id");
    html += '<li>' + id + '</li>';
});
html += "</ul>";
$("#output1").html(html);

// build html for output2
zones = $.unique(zones);
var length = $(zones).length;
var html = "<h4>Zone Count = " + length + "</h4><ul>";
$(zones).each(function () {
    var id = $(this).attr("id");
    html += '<li>' + id + '</li>';
});
html += "</ul>";
$("#output2").html(html);

function getxml() {
    var xml = '\
<?xml version="1.0"?>\
<devices>\
<device id="TPR0012" type="mastervalve">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>test5</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TMV0003" type="mastervalve">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>test6</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TMV0004" type="mastervalve">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>test7</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TPB0001" type="switch">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>Event Switch TPB0001</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TPB0002" type="switch">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>Event Switch TPB0002</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TPD0001" type="switch">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>Event Switch TPD0001</description>\
<status>UK</status>\
<message></message>\
</device>\
<device id="TPD0002" type="switch">\
<lat>0.00000000000000</lat>\
<lng>0.00000000000000</lng>\
<description>Event Switch...