Declaring new elements as references while destructuring within a foreach() head

I want to ask about a quirk that I happened upon. In truth, I expected my code to fail with a fatal error, but it turns out that while using array destructuring in the head of a foreach() loop it is permitted to declare new elements if the value is a reference. Is this a bug or an intended feature? If not a bug should a note/section clarify this behavior? https://www.php.net/manual/en/language.types.array.php My demonstration can be found at this evidently unhelpful question: https://stackoverflow.com/q/77741716/2943403