Bug report

PHPStan version: 12.3.0

Creating an ReflectionClass instance within a class method generated the following error:

Parameter #1 $argument of class ReflectionClass constructor expects 
class-string<T of object>|T of object, string given. |

Example: https://phpstan.org/r/b99b2fa6-f633-4cb9-b034-85fe69e5fb2e

or

Parameter #1 $argument of class ReflectionClass constructor 
expects |class-string<>, string given. |

Example: https://phpstan.org/r/1bf6b512-f082-4234-a344-c9d9711e0dcd

But if I pass a string directly, with a valid class name, it doesn't triggers an error:

Example: https://phpstan.org/r/68fef600-29f9-4775-aee2-8bb35c358224

Expected output

No error, because $argument is either a string containing the name of the class to reflect, or an object.

https://www.php.net/manual/en/reflectionclass.construct.php