Request for MERGED pull requests returns open requests

[Russell Smith]

$pull = new Bitbucket\API\Repositories\PullRequests();
$pull->setClient(
    new \Bitbucket\API\Http\Client(array('timeout' => 0)));
$pull->setCredentials( new Bitbucket\API\Authentication\Basic($bb_user, $bb_pass) );

$list = $pull->all($account_name, $repo_slug, array('state' => 'MERGED'));

[Alexandru Guzinschi]

Because you are creating a custom client instance, you need to enable NormalizeArrayListener before making a request:

$pull->getClient()->addListener(new \Bitbucket\API\Http\Listener\NormalizeArrayListener());

You can read the class description to find what exactly does.