Billing.php

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<?php
namespace Magento\Customer\Model\Customer\Attribute\Backend;

class Billing extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
    public function beforeSave($object)
    {
        $defaultBilling = $object->getDefaultBilling();
        if ($defaultBilling === null) {
            $object->unsetDefaultBilling();
        }
    }

    public function afterSave($object)
    {
        if ($defaultBilling = $object->getDefaultBilling()) {
            $addressId = false;
            foreach ($object->getAddresses() as $address) {
                if ($address->getPostIndex() == $defaultBilling) {
                    $addressId = $address->getId();
                }
            }
            if ($addressId) {
                $object->setDefaultBilling($addressId);
                $this->getAttribute()->getEntity()->saveAttribute($object, $this->getAttribute()->getAttributeCode());
            }
        }
    }
}