Mint a new generation when compose overwrites an object - #2324
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ComposeObject reused the destination's generation, so composing over an existing object on a versioning-enabled bucket archived the old copy and stored the new one under the same generation: a versioned listing showed two entries sharing an id, and the archived copy was no longer addressable on its own. Cloud Storage gives a compose result a new generation like any other write; zero the destination's so addObject mints one. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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ComposeObject reused the destination's generation, so composing over an existing object on a versioning-enabled bucket archived the old copy and stored the new one under the same generation: a versioned listing showed two entries sharing an id, and the archived copy was no longer addressable on its own. Cloud Storage gives a compose result a new generation like any other write; zero the destination's so addObject mints one.