Kendo UI Bug? Grid with JSON data source

Update followed by Cancel reverts field to pre-Update value

by RichardAD

HTML

<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.3.1315/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.3.1315/styles/kendo.default.min.css">
<script src="http://cdn.kendostatic.com/2012.3.1315/js/kendo.core.min.js"></script>
<script src="http://cdn.kendostatic.com/2012.3.1315/js/kendo.web.min.js"></script>
<div id="containers"></div>
<ul>Demonstration:
    <li>Click on Rename in the row with Daphne
    <li>Enter something for Name
    <li>Click OK
    <li>The Name will change to Roger, which corresponds to the updateEmulationXmlString
    <li>Click on Rename again
    <li>Type something
    <li>Now click on Cancel
    <li>The Name will revert to Daphne, this is incorrect.  The response of the prior rename should have updated the _pristine information and Cancel should have gone back to Roger.
    <li>If a database was involved, the data base would be correct and the grid would be showing incorrect data... Not a good thing.

CSS

#containers {border:1px solid black}

JavaScript

readEmulationJsonString
= JSON.stringify ([
    { NodeID: 1001, Name: "Zaphod" },
    { NodeID: 1002, Name: "Daphne" }
]);

updateEmulationJsonString
= JSON.stringify ([
    { NodeID: 1002, Name: "Roger" }
]);

ds1 = new kendo.data.DataSource ({
    transport: {
        read: { url: '/echo/json/', type: 'POST', data: { json: readEmulationJsonString } },
        update: { url: '/echo/json/', type: 'POST', data: { json: updateEmulationJsonString } }
    },
    schema: {
        model: {
            id: 'NodeID',
            fields: {
                NodeID: { editable: false },
                Name:   { editable: true }
            }
        }
    }
});

$('#containers').kendoGrid ({
    dataSource: ds1,
    height:140,
    columns: [
        { field: "Name" },
        { command: [ {name:"edit", text:"Rename"} ], title:"&nbsp;", width:"10em" }
    ],
    editable: {
        mode: "popup"
    }
});