Updating a record in a DataSource doesn't send the old values

[dirkg]

When I update a record in my data source, I don't get to see the old values of the record on the server.

This is my code on the client:

Record newRecord = new Record(oldRecord.toMap()); // make a copy
newRecord.setAttribute("attribute", "new value");
myDataSource.updateData(newRecord);

This is my code on the server:

class MyDataSource extends BasicDataSource {
    /* ... stuff ... */
    public DSResponse executeUpdate(DSRequest req) throws Exception {
        final Map oldValues = req.getOldValues();
        final Map newValues = req.getValues();
        /* ... more stuff ... */
    }
}

oldValues and newValues always contain the same thing. What's up with that? Shouldn't I see the old values in DSRequest.getOldValues()?

I'm using a nightly SmartGWT 2.5.