wp-includes/ID3/module.tag.lyrics3.php:325$charstringbool|null public function IntString2Bool($char) { if ($char == '1') { return true; } elseif ($char == '0') { return false; } return null; }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.lyrics3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.