Option.php

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<?php
namespace Magento\Quote\Model\Quote\Item;

class Option extends \Magento\Framework\Model\AbstractModel implements
    \Magento\Catalog\Model\Product\Configuration\Item\Option\OptionInterface
{
    protected $_item;

    protected $_product;

    protected function _construct()
    {
        $this->_init(\Magento\Quote\Model\ResourceModel\Quote\Item\Option::class);
    }

    protected function _hasModelChanged()
    {
        if (!$this->hasDataChanges()) {
            return false;
        }

        return $this->_getResource()->hasDataChanged($this);
    }

    public function setItem($item)
    {
        $this->setItemId($item->getId());
        $this->_item = $item;
        return $this;
    }

    public function getItem()
    {
        return $this->_item;
    }

    public function setProduct($product)
    {
        $this->setProductId($product->getId());
        $this->_product = $product;
        return $this;
    }

    public function getProduct()
    {
        return $this->_product;
    }

    public function getValue()
    {
        return $this->_getData('value');
    }

    public function beforeSave()
    {
        if ($this->getItem()) {
            $this->setItemId($this->getItem()->getId());
        }
        return parent::beforeSave();
    }

    public function __clone()
    {
        $this->setId(null);
        $this->_item = null;
        return $this;
    }
}