wp-includes/ID3/module.tag.id3v2.php:2209$datastringstring public function DeUnsynchronise($data) { return str_replace("\xFF\x00", "\xFF", $data); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.tag.id3v2.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.