Context: How does \Magento\Sales\Model\Order\CustomerManagement::create() work?

Details: How does \Magento\Framework\DataObject\Copy::_isFieldsetInputValid() work?
Details: How does \Magento\Framework\DataObject\Copy\Config::getFieldset() work?

Details:
- How does
\Magento\Framework\DataObject\Copy::_getFieldsetFieldValue()work? - How does
\Magento\Framework\DataObject\Copy::_setFieldsetFieldValue()work?
Details: How does \Magento\Framework\DataObject\Copy::dispatchCopyFieldSetEvent() work?
