Boolean.php

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

class Boolean extends \Magento\Eav\Model\Entity\Attribute\Backend\AbstractBackend
{
    public function beforeSave($customer)
    {
        $attributeName = $this->getAttribute()->getName();
        $inputValue = $customer->getData($attributeName);
        $inputValue = $inputValue === null ? $this->getAttribute()->getDefaultValue() : $inputValue;
        $sanitizedValue = !empty($inputValue) ? '1' : '0';
        $customer->setData($attributeName, $sanitizedValue);
        return $this;
    }
}