ode>, and <code>Class</code> is        
uppercased, as in common Redis error messages.</p>
 
        <code>Class</code>, <code>Reason</code>, and <code>Message</code> may be an atom, string, or binary
        string.
      </td>
    </tr>
    <tr>
      <td><code>'ok'</code></td>
      <td>The simple string <code>OK</code>.</td>
    </tr>
    <tr>
      <td><code>'nil'</code></td>
      <td>
        A null bulk string. Although semantically equivalent to a null bulk
        array, the null array is never us