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Marco Pivetta ed2cde1b93 Mark Reflection(Method|Property)#setAccessible() as pure starting from PHP 8.1 onwards
This will highlight unused code.

Ref: https://github.com/php/php-src/pull/5412
Ref: https://wiki.php.net/rfc/make-reflection-setaccessible-no-op
Ref: https://github.com/php/php-src/pull/5411

Example https://3v4l.org/PNeeZ

```php
<?php

class Foo {
    private $bar = 'baz';
    private function taz() { return 'waz'; }
}

//var_dump((new ReflectionProperty(Foo::class, 'bar'))->getValue(new Foo));
//var_dump((new ReflectionMethod(Foo::class, 'taz'))->invoke(new Foo));
```

Produces (starting from PHP 8.1):

```
string(3) "baz"
string(3) "waz"
```
2022-12-07 14:22:15 +01:00
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