true MySQL ENUM with Propel

MyModel.php

<?php

class MyModel extends BaseMyModel
{
    public function hydrate($row, $startcol = 0, $rehydrate = false)
    {
        try {
            $this->id = ($row[$startcol + 0] !== null) ? (int) $row[$startcol + 0] : null;
            $this->type = ($row[$startcol + 1] !== null) ? $row[$startcol + 1] : null;
            $this->resetModified();

            $this->setNew(false);

            if ($rehydrate) {
                $this->ensureConsistency();
            }

            return $startcol + 2;
        } catch (Exception $e) {
            throw new PropelException("Error populating MyModel object", $e);
        }
    }
}

MyModelPeer.php

<?php

class MyModelPeer extends BaseMyModelPeer
{
  /** The enumerated values for this table */
  protected static $enumValueSets = array(
    self::TYPE => array(
      MyModelPeer::TYPE_IN => MyModelPeer::TYPE_IN,
      MyModelPeer::TYPE_OUT => MyModelPeer::TYPE_OUT,
    ),
  );
}

MyModelTest.php

<?php

class MyModelTest extends \PHPUnit_Framework_TestCase
{
    public function testEnum()
    {
        $obj = new MyModel();
        $obj->setType(MyModelPeer::TYPE_IN);
        $this->assertTrue((bool) $obj->save());

        $expected = array(
            'IN' => 'IN',
            'OUT' => 'OUT',
        );
        $this->assertEquals($expected, MyModelPeer::getValueSet(MyModelPeer::TYPE));
    }
}

schema.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- ... -->
    <column name="type" type="enum" valueSet="IN,OUT" sqlType="ENUM('IN','OUT')" required="true" />
<!-- ... -->