Sometimes there are good reasons for not cloning, such as underlying resources that can’t be cloned. But I agreed it can be ergonomically easier in many cases.

Sometimes there are good reasons for not cloning, such as underlying resources that can’t be cloned. But I agreed it can be ergonomically easier in many cases. If they truly don’t want it, and you really don’t want to fork, can rewrapping it in an Arc<T> or Arc<Mutex<T>> get you around the problem?