Symfony Workflow integration with multiple $tos

config.yml

framework:
    workflows:
        pull_request:
           type: 'state_machine'
           supports:
                - AppBundle\Entity\PullRequest
           places:
                - init
                - foo
                - bar
           transitions:
                submit:
                    from: init
                    to: [foo, bar]

standalone-multiple-marking-test.php

<?php

require __DIR__.'/vendor/autoload.php';

use Symfony\Component\Workflow\DefinitionBuilder;
use Symfony\Component\Workflow\MarkingStore\MultipleStateMarkingStore;
use Symfony\Component\Workflow\Transition;
use Symfony\Component\Workflow\Workflow;

$builder = new DefinitionBuilder();
$builder->addPlaces(['init', 'foo', 'bar']);
$builder->addTransition(new Transition('submit', 'init', ['foo', 'bar']));
$definition = $builder->build();

$workflow = new Workflow($definition, new MultipleStateMarkingStore());

$subject = new \stdClass();
$subject->marking = null;

$workflow->apply($subject, 'submit');
assert($subject->marking === ['foo' => 1, 'bar' => 1]);

// Works

symfony-multiple-marking-test.php

/** @var Workflow $stateMachine */
$stateMachine = $this->container->get('state_machine.pull_request');

$pr = new PullRequest();
$pr->marking = ['start'];

$stateMachine->apply($pr, 'submit');

// Result:
InvalidDefinitionException in StateMachineValidator.php line 40:
A transition from a place/state must have an unique name. Multiple transitions named "submit" from place/state "init" where found on StateMachine "pull_request"