code: private function isSaleItemCovered(Common\SaleItemInterface $saleItem, array $coveredIds)
      {
          // Skip compound with only public children
          if ($saleItem->isCompound() && !$saleItem->hasPrivateChildren()) {
              return true;
          }
  
          if (!in_array($saleItem->getId(), $coveredIds, true)) {
              return false;
          }
  
          foreach ($saleItem->getChildren() as $child) {
              if (!$this->isSaleItemCovered($child, $coveredIds)) {
                  return false;
              }
          }
  
          return true;
      }
docs: Returns whether the given sale item is covered by this shipment.
  
  @param Common\SaleItemInterface $saleItem
  @param array                    $coveredIds
  
  @return bool