* function gets passed two arguments: The XMLHttpRequest object and a
* string describing the type the success of the request.
*
- * (String) data - Data to be sent to the server. Converted to a query
+ * (Object|String) data - Data to be sent to the server. Converted to a query
* string, if not already a string. Is appended to the url for GET-requests.
* Override processData option to prevent processing.
*