Handsontable sort bug

HTML

<script src="http://handsontable.com/dist/jquery.handsontable.full.js"></script>
<link rel="stylesheet" href="http://handsontable.com/dist/jquery.handsontable.full.css">
<link rel="stylesheet" href="http://handsontable.com/demo/css/samples.css">
<h2>Handsontable sort bug</h2>

<div id="exampleGrid" class="dataTable"></div>

CSS

body {
    background-color: white;
    margin: 20px;
}
h2 {
    margin: 20px 0;
}

JavaScript

var myData = [
    {a: false, b: 2, c: 3},
    {a: false, b: 10, c: 11},
    {a: true, b: 11, c: -4}
    ];

function customIsEmptyRow(row) {
    var data = $("#exampleGrid").handsontable("getData")
    return data[row].isNew;
}

$("#exampleGrid").handsontable({
    data: myData,
    minSpareRows: 1,
    rowHeaders: true,
    colHeaders: ["A", "B", "C"],
    columns: [
        { data: "a", type: "checkbox" },
        { data: "b", type: "text" },
        { data: "c", type: "text" },
    ],
    dataSchema: {isNew: true, a: false}, // default for a to avoid #bad value#
    columnSorting: true
    //isEmptyRow: customIsEmptyRow
});