Form ChoiceType: entityChoiceList vs ObjectChoiceList

gistfile1.php

<?php

//$this->getUser()->getCandidates() returns an array of EUser entities

$entityChoiceListForm = $this->createForm('choice', null, array(
    'choice_list' => new EntityChoiceList(
        $this->get('doctrine')->getManager(),
        'SSCoreBundle:EUser',
        'name',
        null,
        $this->getUser()->getCandidates()
    ),
));

$objectChoiceListForm = $this->createForm('choice', null, array(
    'choice_list' => new ObjectChoiceList($this->getUser()->getCandidates(), 'name'),
));
        
$objectChoiceListForm->bind(array('choice' => 0));     // select the first item of the list  
$entityChoiceListForm->bind(array('choice' => 0));     // select the first item of the list  

assertEquals($entityChoiceListForm->getData(), $objectChoiceListForm->getData(), 'form data should be the same'); // failure

// The `ObjectChoiceList` fails to retrieve the element of index: 0

@bschussek any idea why this behavior, or if I do something wrong ?