wp-includes/SimplePie/src/Misc.php:1708string public static function get_curl_version() { if (is_array($curl = curl_version())) { $curl = $curl['version']; } else { $curl = '0'; } return $curl; }One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
none 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.