kiesel/xp-framework — comment on commit 8a82f050de58cc106f41d3a5266d0c540a9c3c19
File: core/src/main/php/lang.base.php line 620
By thekid:

...`' extends \\'.$type`... prevents this from working in PHP 5.2.x, which we still support with XP 5.9