wp-includes/Text/Diff.php:330$origpublic$finalpublicabstract class Text_Diff_Op { var $orig; var $final; abstract function &reverse(); function norig() { return $this->orig ? count($this->orig) : 0; } function nfinal() { return $this->final ? count($this->final) : 0; } }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/Text/Diff.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.