[PHP 7.2] My fix for «Declaration of Magento\Directory\Model\Config\Source\Country\Full::toOptionArray($isMultiselect = false) must be compatible with Magento\Directory\Model\Config\Source\Country::toOptionArray»

It is similar to:

• [PHP 7.2] My fix for «Declaration of Magento\Customer\Model\ResourceModel\Address\Attribute\Source\Country::getAllOptions() must be compatible with Magento\Eav\Model\Entity\Attribute\Source\Table::getAllOptions($withEmpty = true, $defaultValues = false)».
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• [PHP 7.2] My fix for «Declaration of Magento\Customer\Model\ResourceModel\Address\Attribute\Source\Region::getAllOptions() must be compatible with Magento\Eav\Model\Entity\Attribute\Source\Table::getAllOptions($withEmpty = true, $defaultValues = false)».
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• [PHP 7.2] My fix for «Declaration of Magento\Customer\Model\Customer\Attribute\Source\Website::getAllOptions() must be compatible with Magento\Eav\Model\Entity\Attribute\Source\Table::getAllOptions($withEmpty = true, $defaultValues = false)».
• [PHP 7.2] My fix for «Declaration of Magento\Eav\Model\Entity\Attribute\Source\Store::getAllOptions() must be compatible with Magento\Eav\Model\Entity\Attribute\Source\Table::getAllOptions($withEmpty = true, $defaultValues = false)».
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My fix

Replace the line:

with the following one:

public function toOptionArray($isMultiselect = false, $foregroundCountries = '')