self::class, parent::class and static::class are not correctly resolved into their corresponding strings

[Ocramius]

Example:

<?php

declare(strict_types=1);

use Roave\BetterReflection\BetterReflection;
use Roave\BetterReflection\Reflector\ClassReflector;
use Roave\BetterReflection\SourceLocator\Type\StringSourceLocator;

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

$foo = (new ClassReflector(
    new StringSourceLocator(
        <<<'PHP'
<?php

class Baz {
}

class Foo extends Baz {
    public $bar = self::class;
    public $baz = static::class;
    public $taz = parent::class;
}
PHP
        ,
        (new BetterReflection())->astLocator()
    )
))->reflect('Foo');

var_dump($foo->getDefaultProperties());

The output will be something like:

array(3) {
  'bar' =>
  string(4) "self"
  'baz' =>
  string(6) "static"
  'taz' =>
  string(6) "parent"
}

The expected output should be:

array(3) {
  'bar' =>
  string(4) "Foo"
  'baz' =>
  string(6) "Foo"
  'taz' =>
  string(6) "Baz"
}