title: Decimal precision in an EXTJS grid
body: <p>I have a grid which lets a user enter in a number by editing the row. I want the number to support 4 decimal places, but it only supports 2. I figured out how to display 4 decimal places but it doesn't register anything more than 2 decimal places.</p>
  
  <p>So if the user enters 1000.1111 the resulting field will show 1000.1100 in the grid. How can I tell the model that the field is precise to 4 decimal places?</p>
  
  <p>My field in the model looks like this:</p>
  
  <pre><code>{name: 'Price_Customer__c', type: 'number'},
  </code></pre>
  
  <p>The column in the grid is set up like this:</p>
  
  <pre><code>{
              header: 'Price to Customer',
              flex: 0,
              width: 100,
              sortable: true,
             renderer:  Ext.util.Format.numberRenderer('$0,000.0000'),
              dataIndex: 'Price_Customer__c',
              summaryType: 'sum',
              field: {
                  xtype: 'numberfield'
              }
          },
  </code></pre>