Context: How does \Magento\Sales\Model\ResourceModel\Order\Shipment\Relation::processRelation()
work?
Details: How does \Magento\Sales\Model\ResourceModel\EntityAbstract::_beforeSave()
work?
Details: How does \Magento\Sales\Model\ResourceModel\EntityAbstract::saveNewObject()
work?
Details: How does \Magento\Framework\Model\ResourceModel\Db\VersionControl\AbstractDb::processAfterSaves()
work for a shipment item?