Minqty.php

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<?php
namespace Magento\CatalogInventory\Model\System\Config\Backend;

class Minqty extends \Magento\Framework\App\Config\Value
{
    public function beforeSave()
    {
        parent::beforeSave();
        $minQty = (int) $this->getValue() >= 0 ? (int) $this->getValue() : (int) $this->getOldValue();
        $this->setValue((string) $minQty);
        return $this;
    }
}