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I create a DataTable,then visit a cell. for some reason I add a row in table, then visit that cell again.Finally, I find this Node is diffrent from the previous although it in the same Model.

example:
var table = Y.DataTable();
var td1 = table.getCell([0,0]);
table.addRow(...); // I am sure this row added at last.
//without addRow,there can be another operation,like table.sort(),table.removeRow,table.addColumn() etc.
var td2 = table.getCell([0,0]);
alert(td1==td2); //false.

Actually, td1 and td2 are the same cell in table, just after operation, td1 was replaced by td2.I want to know why is that.(No table.synUI() excute except on table's init at first)