Crash in `Socket.append<T>(callback:to:)` function about swiftphoenixclient HOT 5 CLOSED

Could you provide the whole stack? And what version of the client are you running

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I'm running version 5.3.0. Here's the call stack:

I did some more investigating this morning, and this crash virtually disappears when I call Channel.join() from the main thread (which I'd obviously like to avoid) vs. a background thread. Based on that I'm pretty confident it's a threading issue, but I'll keep looking into it too.

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Converting the stateChangeCallbacks to a SynchronousArray seems to have helped, though I haven't had time to do any extensive testing or look for unwanted side effects yet. I should get around to that later today and could put up a PR with the change if it looks ok and there aren't any concerns from your side @dsrees!

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I made a PR here. Let me know if you have any questions or concerns, or if there's any important context I'm missing.

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should be resolved in 5.3.1. Thanks for your patience, please let me know if something else pops up

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