wp-includes/ID3/module.tag.id3v2.php:3722$stringstringstring public static function MakeUTF16emptyStringEmpty($string) { if (in_array($string, array("\x00", "\x00\x00", "\xFF\xFE", "\xFE\xFF"))) { // if string only contains a BOM or terminator then make it actually an empty string $string = ''; } return $string; }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.