Priority.php

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<?php
namespace Magento\Sitemap\Model\Config\Backend;

class Priority extends \Magento\Framework\App\Config\Value
{
    public function beforeSave()
    {
        $value = $this->getValue();
        if ($value < 0 || $value > 1) {
            throw new \Exception(__('The priority must be between 0 and 1.'));
        } elseif ($value == 0 && !($value === '0' || $value === '0.0')) {
            throw new \Exception(__('The priority must be between 0 and 1.'));
        }
        return $this;
    }
}