wp-includes/ID3/getid3.php:2102$filenamestringbool public static function is_writable ($filename) { $ret = is_writable($filename); if (!$ret) { $perms = fileperms($filename); $ret = ($perms & 0x0080) || ($perms & 0x0010) || ($perms & 0x0002); } return $ret; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/getid3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.