td><code>{bulk, IOList}</code></td>
      <td>
        Bulk strings. This allows using an IOList for a bulk string when
        performing server encoding, as lists are encoded as arrays.
      </td>
    </tr>
    <tr>
      <td>
        <code>{error, Message}</code><br>
        <code>{error, {Class, Reason}}</code>
      </td>
      <td><p>
        Errors. If the second form is used, <code>Class</code> and <code>Reason</code> are encoded
        into a single error message of the form <code>CLASS Reason</c