code: protected function getSetItem($dataMember, $offset, $quote = true)
      {
          $item = $this->{$dataMember}[$offset];
          switch ($item[1]) {
              case 'varchar':
                  $type = 'varchar(255)';
                  break;
              default:
                  $type = $item[1];
          }
          $this->{$dataMember}[$offset][1] = $type;
          
          return $this->getArrayItem($dataMember, $offset, $quote);
      }
docs: Converts field types to real values that match this adaptor's DB type.