Send 1/0 instead of true / false in a checkbox within a grid (editor)

I have this code:

{                    
 xtype: 'checkcolumn',
 header: 'Contacto de Emergencia',
 dataIndex: 'contactoEmergencia',
 listeners: {
       beforecheckchange: function() {
            return false;
       }
 },
 width: 60,
 editor: {
     xtype: 'checkbox',
     cls: 'x-grid-checkheader-editor',
     inputValue: 1,
     uncheckedValue: 0                
 }   

}

When I try to insert a new row into the grid, when I press enter and activate the event to insert the data in this cell, it is sent to me as true: if the checkbox is activated and false: if it is not activated but I need it change those values that you are sending by default by 1 instead of true and 0 instead of false.

Does anyone know how to make this change?