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        <title>Multi-Pool CopyObject: Cross-Pool Historical Version Self-Copy, Moving-Pool Authority, and Compression Indexes</title>
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        <description>Why copying a historical version of an object onto its own key failed with 404 NoSuchVersion across server pools, why placement and rewrite decisions must run before encryption and compression transforms, and why pooled copy rewrites must forward IndexCB for multi-block S2 ranged reads.</description>
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