Reflection parameter type could be more precise about specific BackedEnum::from() and tryFrom() type

Description

The following code:

<?php

declare(strict_types=1);

enum IntBacked: int {
    case One = 1;
}

$rm = new ReflectionMethod(IntBacked::class, 'tryFrom');
var_export((string) $rm->getParameters()[0]->getType());

Resulted in this output:

'string|int'

But I expected this output instead:

'int'

Because when a bad type is passed in there, it's rejected with TypeError:

Argument #1 ($value) must be of type int, string given

Related: https://github.com/php/php-src/issues/12863

PHP Version

PHP 8.1+

Operating System

No response

首先运行提供的 PHP 代码片段，并针对特定的入口点 BackedEnum::tryFrom() 跟踪 ReflectionMethod::getParameters()。确认反射对 IntBacked::tryFrom() 报告为 int，同时传入字符串仍会产生所示的 TypeError；issue 中没有指定源文件或测试路径。