Incorrect Construction of Advanced Criteria with 'BETWEEN' Criterion

[dpassen1]

SmartGWT 2.4, Firefox 3,4 and Chrome 10.

Criterion criterion = new Criterion("itemCount",OperatorId.BETWEEN);
criterion.setAttribute("start", 1);
criterion.setAttribute("end", 10);
AdvancedCriteria  queryCrit = new AdvancedCriteria(criterion);

When inspected, printed out, or sent to the server:

{"operator":"between","fieldName":"itemCount"}

Expected value is:

{"fieldName":"itemCount","operator":"between","start":"1","end":"10"}

]