Edit arrays using angular-xeditable

I pull some objects from my api using ngResource an then I show them in a table. Thats ok.. the problem become when I try to make 'tags' attribute editable using angular-xeditable but are treated as string and there isn't something like "ngList" on angular-xeditable. The only solution I can think of is serialize that "tags" attribute to "tagsString" on my service and unserialize it once $save() was called.. there is a more elegant solution?

Object:

{
    "id": "yP8",
    "uploadDate": "2012-10-03T12:52:59-0300",
    "statusChangeDate": "2012-10-03T12:52:59-0300",
    "status": 0,
    "type": 1,
    "mimeType": "JPEG",
    "title": "title-36868",
    "tags": [
        'some-tag',
        'fancy-tag'
    ],
    "language": "en",
    "interactions": {
        "likes": 12371,
        "dislikes": 15,
        "comments": 81
    },
    "published": true
}

Controller:

app.controller( 'ContentsCtrl', function CommentsCtrl( $scope, Contents ) {
    $scope.contents = Contents.query();
});

Template:

<tr ng:repeat="content in contents.content">
    <td>{{content.id}}</td>
    <td ng:click="content.images.showFull=!content.images.showFull">
        <img src="{{content.images.thumbnail.url}}" ng:show="!content.images.showFull">
        <img src="{{content.images.medium.url}}" ng:show="content.images.showFull">
    </td>
    <td>{{content.status}}</td>
    <td>
        <span editable-text="content.title" e-required>{{content.title}}</span>
    </td>
    <td>
        <span editable-text="content.tags">{{content.tags}}</span>
    </td>
    <td>{{content.language}}</td>
</tr>

EDIT:

Demo (by Sebastian Gärtner): http://plnkr.co/edit/ttPNgHXUZKmaJZ9IuB2N?p=preview