[Ext: 4.1 RC1] Problem with store

[icode]

I have just recently started our upgrade to 4.1RC1. Right off the bat I am running into this issue. On 4.0.7 our stores contained values for fields that were not explicitly defined in the model and we relied on that heavily. Now I cannot access a field if I didn't explicitly define it before hand on my model. Here is a simple example.
Data:

var data = {
      data1: 4,
      data2: 1,
      data1_subset: 3,
      data2_subset: 3
}

Store:

aStore = Ext.create('Ext.data.JsonStore', {
      fields: ["data1, data2"],
     data: data
});

Chart:

Ext.create('Ext.chart.Chart', {
.
.
tips: {
    renderer: function(record, item) {
    //doesn't work on 4.1RC1
     var subset = record.data.data1_subset
    }
}

The store is used by grid and chart which doesn't care about "data1_subset", but in my chart's tooltip I need information on "data1_subset". Before I could access undefined fields on my tips' renderer function. Now it seems I do not have access to my data1_subset. Am I missing something? Is there a way to force my model/jsonStore to hold everything I assign in the "data" property?

[evant]

Try this:

Ext.onReady(function() {
    var data = [{
        data1: 4,
        data2: 1,
        data1_subset: 3,
        data2_subset: 3
    }];
    
    var s = Ext.create('Ext.data.Store', {
        fields: ["data1, data2"],
        data: data
    });

    console.log(s.first().raw);
});