public function testIsBuiltin()
{
$this->assertTrue(ReflectionType::createFromType(new Types\String_(), false)->isBuiltin());
$this->assertTrue(ReflectionType::createFromType(new Types\Integer(), false)->isBuiltin());
$this->assertTrue(ReflectionType::createFromType(new Types\Array_(), false)->isBuiltin());
$this->assertFalse(ReflectionType::createFromType(new Types\Object_(), false)->isBuiltin());
}