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The issue with KV is the write propagation delays across nodes can be up to 10s, so for a back and forth like this that needs to happen quickly it doesn’t work. My original version supported KV but I dropped it because it often failed to connect due to these delays.

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Ah. There's also "durable objects", which route requests to the kv POP where it was created, so no propogating, but they can only hold 32kb.

Ah yep. I guess you could do http polling with a durable object - would have to do the math to see if that had lower expected costs. Websocket are prohibitively expensive.

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