Description:
------------
Magic methods from this RFC https://wiki.php.net/rfc/magic-methods-signature should support covariance but don't. You should be able to narrow down a return type but currently can't.

Test script:
---------------
<?php

class Foo
{
	/**
	 * @param mixed[] $properties
	 * @return Type
	 */
	public static function __set_state(array $properties): self
	{
		return new self();
	}
}

Expected result:
----------------
nothing

Actual result:
--------------
Fatal error: Foo::__set_state(): Return type must be object when declared in...