duplicate elements dropped during parse

[javamonkey79]

Given the following example atom file:

<?xml version='1.0' encoding='UTF-8'?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:ed="http://www.edmunds.com/content">
    <id></id>
    <title type="text">Lorem Ipsum Dolor Sit Amet</title>
    <subtitle type="text" />
    <updated>2013-01-08T12:04:00.000Z</updated>
    <category term="value1" />
    <category term="value2" />
    <category term="value3" />
    <ed:metadata name="titleTag">Lorem Ipsum Dolor Sit Amet</ed:metadata>
    <ed:metadata name="metaKeywords">placeholder, Placeholder, Placeholder Placeholder, Placeholder Placeholder</ed:metadata>
    <ed:metadata name="metaDescription">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.</ed:metadata>
    <ed:metadata name="canonical" />
    <entry>
        <title type="text" />
        <summary type="text" />
        <content type="html">
            &lt;h3>Lorem Ipsum Dolor Sit Amet&lt;/h3>
            &lt;p>August 19, 2009&lt;/p>
            &lt;p>&lt;img alt="placeholder.jpg" class="mt-image-none" src="//static.placeholder.com/img/placeholder.jpg" width="618" />&lt;/p>
            &lt;p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.&lt;/p>
            &lt;p>Donec nec efficitur tellus. Aenean non lorem sit.&lt;/p>
            &lt;p>Nulla facilisi. Sed cursus, justo et auctor vehicula, lorem metus lacinia velit, nec ullamcorper risus ligula nec ligula.&lt;/p>
            &lt;p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.&lt;/p>
            &lt;p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.&lt;/p>
            &lt;p>Lorem Ipsum&lt;/p&gt;</content>
    </entry>
</feed>

When it is parsed, I get the following back from feedparser:

{
    "bozo": false,
    "entries": [
        {
            "title": "",
            "title_detail": {
                "type": "text/plain",
                "language": null,
                "base": "",
                "value": ""
            },
            "summary": "",
            "summary_detail": {
                "type": "text/plain",
                "language": null,
                "base": "",
                "value": ""
            },
            "content": [
                {
                    "type": "text/html",
                    "language": null,
                    "base": "",
                    "value": "<h3>Lorem Ipsum Dolor Sit Amet</h3>\n            <p>August 19, 2009</p>\n            <p><img alt=\"placeholder.jpg\" class=\"mt-image-none\" src=\"//static.placeholder.com/img/placeholder.jpg\" width=\"618\" /></p>\n            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.</p>\n            <p>Donec nec efficitur tellus. Aenean non lorem sit.</p>\n            <p>Nulla facilisi. Sed cursus, justo et auctor vehicula, lorem metus lacinia velit, nec ullamcorper risus ligula nec ligula.</p>\n            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.</p>\n            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum.</p>\n            <p>Lorem Ipsum, Placeholder Editor @ Placeholder miles</p>"
                }
            ]
        }
    ],
    "feed": {
        "id": "",
        "guidislink": true,
        "link": "",
        "title": "Lorem Ipsum Dolor Sit Amet",
        "title_detail": {
            "type": "text/plain",
            "language": null,
            "base": "",
            "value": "Lorem Ipsum Dolor Sit Amet"
        },
        "subtitle": "",
        "subtitle_detail": {
            "type": "text/plain",
            "language": null,
            "base": "",
            "value": ""
        },
        "updated": "2013-01-08T12:04:00.000Z",
        "updated_parsed": [
            2013,
            1,
            8,
            12,
            4,
            0,
            1,
            8,
            0
        ],
        "tags": [
            {
                "term": "value1",
                "scheme": null,
                "label": null
            },
            {
                "term": "value2",
                "scheme": null,
                "label": null
            },
            {
                "term": "value3",
                "scheme": null,
                "label": null
            }
        ],
        "ed_metadata": {
            "name": "canonical"
        }
    },
    "headers": {},
    "encoding": "utf-8",
    "version": "atom10",
    "namespaces": {
        "": "http://www.w3.org/2005/Atom",
        "ed": "http://www.edmunds.com/content"
    }
}

So, the category elements show up even though they are duplicated, but the "ed_metadata" (ed:metadata from the original) elements are overwritten by the last one. I've also tested it without that last "canonical" one and the data in the metaDescription Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus lacinia odio vitae vestibulum. is dropped too.

Is this a bug or intended functionality?