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Adds inherent `downcast_ref` and `is` inherent methods to: - `dyn Subscriber + Send` - `dyn Subscriber + Sync` - `dyn Subscriber + Send + Sync` - `Layered` These additional implementations reduce the circumstances in which one must cast to `dyn Subscriber` (which, previously, was the only type for which `downcast_ref` and `is` were available).