Mapper.php

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<?php
namespace Magento\Customer\Model\Address;

use Magento\Customer\Api\Data\AddressInterface;
use Magento\Framework\Api\ExtensibleDataObjectConverter;

class Mapper
{
    private $extensibleDataObjectConverter;

    public function __construct(ExtensibleDataObjectConverter $extensibleDataObjectConverter)
    {
        $this->extensibleDataObjectConverter = $extensibleDataObjectConverter;
    }

    public function toFlatArray($addressDataObject)
    {
        $flatAddressArray = $this->extensibleDataObjectConverter->toFlatArray(
            $addressDataObject,
            [],
            \Magento\Customer\Api\Data\AddressInterface::class
        );
        //preserve street
        $street = $addressDataObject->getStreet();
        if (!empty($street) && is_array($street)) {
            // Unset flat street data
            $streetKeys = array_keys($street);
            foreach ($streetKeys as $key) {
                unset($flatAddressArray[$key]);
            }
            //Restore street as an array
            $flatAddressArray[AddressInterface::STREET] = $street;
        }
        return $flatAddressArray;
    }
}