wp-includes/SimplePie/src/Enclosure.php:491Get the preferred handler
string|null public function get_handler() { return $this->get_real_type(true); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/SimplePie/src/Enclosure.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.