wp-includes/SimplePie/src/Item.php:2356 protected function get_sanitize(): Sanitize { if ($this->sanitize === null) { $this->sanitize = new Sanitize(); } return $this->sanitize; }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/SimplePie/src/Item.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.