Single record in store is note passed as an Array in Rest Sync

Hello,

So I have the follwing model and store:

Code:

Ext.define('MyApp.Map.Marker', {
    extend: 'Ext.data.Model',    
    idProperty: 'id',
    fields: [
        {name: 'id', type: 'int'},
        {name: 'latitude', type: 'float'},
        {name: 'longitude', type: 'float'},
    ]
});


var markerStore = Ext.create('Ext.data.Store', {
    model: 'MyApp.Map.Marker',
    proxy: {
        type: 'rest',        
        batchActions: true,
        appendId: false,
        reader: { type: 'json', root: 'vertices' },
        writer: {type: 'json', root: 'vertices'},
        api: {
            create: '/vertices/batch',
        read: '/vertices',
        update: '/vertices/batch',
        destroy: '/vertices/batch'
        }
    }, 
    listeners: {
        wirte: function(){
            console.log("I've written!");
        }
    }
 });

So, as you can see, I configured to sync in batch, making only 3 request (one for create, one for update, and one for delete) instead of doing one for each modified record.

Everything is working fine except that when I have only one recordo to create, for example, my vertices param is a object instead of an array.

Like this. Two or more records:

Code:

"vertices"=>[{"id"=>0, "latitude"=>-22.891990243585727, "longitude"=>-47.20001220703125}, {"id"=>0, "latitude"=>-22.86668527847696, "longitude"=>-47.05101013183594}]

Single record

Code:

"vertices"=>{"id"=>0, "latitude"=>-22.916025590238377, "longitude"=>-47.330474853515625

Is there a way I can force ExtJS to put this single record in an Array?

Is that a normal Javascript behavior, or is just ExtJS? Because, for me, makes no sense, since it's a batch operation, to send the single record out of an Array.