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Also, why use Uuids instead of a pair of user_id: u64, order_id: u64?

Leaking the number of orders seemed like a bad idea

Are you planning to hook your order book up to a data feed like, for example, binance[1] to see how your book performs?

Yeah I was planning on playing around with the performance/optimizing it. Didn't know about that binance data feed though, thanks.