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ff1d23eccb
Previously this held a pointer to the Fiber itself, which requires marking it (which was only implemented recently, prior to that it was buggy). Using a monotonically increasing integer instead allows us to avoid having a free function and keeps everything simpler. My main motivations in making this change are that the root fiber lazily allocates self, which makes the writebarrier implementation challenging to do correctly, and wanting to avoid sending Mutexes to the remembered set when locked by a short-lived Fiber.