SmartObject breaks DI in PHP 7.4

[delacry]

Version: latest

Bug Description

When you want to use DI in classes that are using SmartObject, and you define type of variable, magic function __set and __get (when getting) is called and SmartObject throws an exception, because variable is not public, there is also exception in &__get method.

Steps To Reproduce

Define data types in properties and inject them in a constcutror. I'm not sure if it is PHP bug or a new behaviour, this is example PHP code, __set is called when $this->testOne is initialised.

new class(new class() {}, new class() {}) {
 private object $testOne;
 private $testTwo;
 
 public function __construct(
 object $testOne, 
 object $testTwo
 ) {
 $this->testOne = $testOne;
 $this->testTwo = $testTwo;
 }
 
 public function __set(string $name, $value)
 {
 echo $name . ': ' . get_class($value) . PHP_EOL;
 }
};

Possible Solution

I'm not sure if it's a PHP bug (tested on php7.4beta-4), or it should happend, I didn't find any resources why is it happening.

[JanTvrdik]

That's odd. The RFC mentions using __get but does not mention using __set.

EDIT: better example https://3v4l.org/gnjeU
EDIT: relevant PHP bug https://bugs.php.net/bug.php?id=78226

[delacry]

Now I found that they discuss it also in this PR php/php-src#4696 (not merged), because it causes also problems in doctrine orm.

[peldax]

Solution was merged: php/php-src#4856