Summary.php

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<?php
namespace Magento\Checkout\Model\Config\Source\Cart;

class Summary implements \Magento\Framework\Option\ArrayInterface
{
    public function toOptionArray()
    {
        return [
            ['value' => 0, 'label' => __('Display number of items in cart')],
            ['value' => 1, 'label' => __('Display item quantities')]
        ];
    }
}