TypeCaster.php

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<?php
namespace Magento\Framework\Reflection;

use Magento\Framework\Serialize\Serializer\Json;

class TypeCaster
{
    private $serializer;

    public function __construct(Json $serializer)
    {
        $this->serializer = $serializer;
    }

    public function castValueToType($value, $type)
    {
        if ($value === null) {
            return null;
        }

        if (is_array($value) && !interface_exists($type) && !class_exists($type)) {
            return $this->serializer->serialize($value);
        }

        if ($type === "int" || $type === "integer") {
            return (int)$value;
        }

        if ($type === "string") {
            return (string)$value;
        }

        if ($type === "bool" || $type === "boolean" || $type === "true" || $type == "false") {
            return (bool)$value;
        }

        if ($type === "float") {
            return (float)$value;
        }

        if ($type === "double") {
            return (double)$value;
        }

        return $value;
    }
}