Number.php

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<?php
namespace Magento\Framework\Data\Argument\Interpreter;

use Magento\Framework\Data\Argument\InterpreterInterface;

class Number implements InterpreterInterface
{
    public function evaluate(array $data)
    {
        if (!isset($data['value']) || !is_numeric($data['value'])) {
            throw new \InvalidArgumentException('Numeric value is expected.');
        }
        $result = $data['value'];
        return $result;
    }
}