I learnt two things today about #rust and #tokio :

- `spawn_blocking` never gets cancelled, it will continue to run and finish your closure, even if the task waiting for the result is cancelled/dropped

- a `JoinHandle` will silently drop values without letting you know about them if that handle is dropped. Especially if the async task calling that method is cancelled/dropped

I discovered this by creating a wrapper which impl'd drop and printed out a log when the value was dropped