How does a shipment item saving work?

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?

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