can reuse the array when ((union alloc_header *)data)[-1].ref is zero.
"But now it's a case of how do you make it robust, how do you make it at scale, and how do you actually make it at a reasonable price?"
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After a recovery ship lifted it out of the water, the astronauts beamed and waved as they were helped out of the hatch, along with fellow crew members astronaut Nick Hague and cosmonaut Aleksandr Gorbunov.
Carry propagation — threading carry information across positions