wp-includes/SimplePie/src/HTTP/RawTextResponse.php:72$namestring public function get_header(string $name): array { return isset($this->headers[strtolower($name)]) ? $this->headers[$name] : []; }Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/SimplePie/src/HTTP/RawTextResponse.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.