No automatic sort?

Currently it seems like the datatables are sorted by the order of the contents from the first column. I'd like to have a possibility, where the default sorting order is as the table is created in the HTML. So:

<table>
    <thead>
        <th>Number</th>
    </thead>
    <tbody>
        <tr><td>2</td></tr>
        <tr><td>1</td></tr>
        <tr><td>3</td></tr>
    </tbody>
</table>

would be displaying 2-1-3, not 1-2-3.