Qtyincrements.php

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

use Magento\Framework\Exception\LocalizedException;

class Qtyincrements extends \Magento\Framework\App\Config\Value
{
    public function beforeSave()
    {
        $value = $this->getValue();
        if (floor($value) != $value) {
            throw new LocalizedException(
                __("Quantity increments can't use decimals. Enter a new increment and try again.")
            );
        }
    }
}