wp-includes/Requests/src/Utility/CaseInsensitiveDictionary.php:136Get the headers as an array
array public function getAll() { return $this->data; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Requests/src/Utility/CaseInsensitiveDictionary.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.