wp-includes/SimplePie/src/Source.php:88$elementoptional[] public function get_base($element = []) { return $this->item->get_base($element); }2 changes between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$element retyped from untyped to array.verified against sourcenone to string.verified against sourcesrc/wp-includes/SimplePie/src/Source.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.