code: function(oData) {
          //Convert to number
          var number = oData * 1;
  
          // Validate
          if(lang.isNumber(number)) {
              return number;
          }
          else {
              YAHOO.log("Could not validate data " + lang.dump(oData) + " to type Number", "warn", this.toString());
              return undefined;
          }
      }
docs: Validates data value to type Number, doing type conversion as
  necessary. A valid Number value is return, else null is returned
  if input value does not validate.
  
  
  @method DataTable.validateNumber
  @param oData {Object} Data to validate.
  @static