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These two commits resolve the issue of unbounded memory growth in cernan. It turns out every messages sent through Sender would cause 128 bytes to be pushed onto an unbounded VecDeque. In a previous life this VecDeque was used for proper coordination between the Senders and its Receiver but the optimization made in #5 broke this need. In doing so, we also broke the emptying of this deque.
This is now corrected and hopper will use a bounded amount of memory.