wp-includes/SimplePie/src/Misc.php:249$urlstringstring public static function normalize_url(string $url) { $iri = new \SimplePie\IRI($url); return $iri->get_uri(); }2 changes between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$url retyped from untyped to string.verified against sourcenone to string.verified against sourcesrc/wp-includes/SimplePie/src/Misc.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.