Template method that is to validate the provided Ext.data.Record
against the filters configuration.
@param {Ext.data.Record} record The record to validate
@return {Boolean} true if the record is valid within the bounds
of the filter, false otherwise.
function (record) {
        var val = record.get(this.dataIndex),
            values = this.getValue(),
            isNumber = Ext.isNumber;
        if (isNumber(values.eq) && val != values.eq) {
            return false;
        }
        if (isNumber(values.lt) && val >= values.lt) {
            return false;
        }
        if (isNumber(values.gt) && val <= values.gt) {
            return false;
        }
        return true;
    }