Question: Thread-safety / Rc use in async code?

While reading the code, I've discovered a lot of the items here are actually !Send + !Sync due to use of Rc in types. This would pose a problem for my app, which uses A LOT of async code, but, as capturing !Send + !Sync items makes the future !Send + !Sync, I wouldn't really be able to use the future anywhere in my runtime...

Is there a way to make types in this library Send + Sync so one can send them between threads?