Weirdness with EasyRdf

gistfile1.php

<?php

include_once('/usr/share/php/EasyRdf.php');

$graph = new EasyRdf_Graph();

$graph->add('http://example.com/2', 'rdf:p', 'label');
$graph->addResource('http://example.com/1', 'rdf:p', 'http://example.com/2');

$resources = $graph->resourcesMatching('rdf:p', 'label');
var_dump(in_array('http://example.com/2', $resources));
var_dump(in_array(new EasyRdf_Resource('http://example.com/2'), $resources));

var_dump(in_array($graph->resource('http://example.com/2'), $resources));