wp-includes/PHPMailer/PHPMailer.php:5209Allows for public read access to 'all_recipients' property.
array public function getAllRecipientAddresses() { return $this->all_recipients; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/PHPMailer/PHPMailer.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.