wp-includes/SimplePie/src/SimplePie.php:957Set a PSR-16 implementation as cache
$cachePsr\SimpleCache\CacheInterfacevoid public function set_cache(CacheInterface $cache) { $this->cache = new Psr16($cache); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/SimplePie/src/SimplePie.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.