wp-includes/Requests/src/Response/Headers.php:124Get an iterator for the data
ArrayIterator public function getIterator() { return new FilteredIterator($this->data, [$this, 'flatten']); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Requests/src/Response/Headers.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.