wp-includes/SimplePie/src/File.php:325 public function get_headers(): array { $this->maybe_update_headers(); return $this->parsed_headers; }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/SimplePie/src/File.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.