You won't believe it, but just right now I've been thinking about that it would be a wonderful feature for PHP to have some kind of type-tests (like `$a is Foo&Bar` or `$b is Foo|Baz|null`), and here you write out this email.
I didn't read the whole RFC, but I'd like to say that having at least aforementioned type tests would be really helpful Thank you for your effort and have a nice day!
