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niksis02
e1d72907e4
Fixes #2165 `GetObject` marked an object carrying no `versionIdKey` attribute as the null version and then overwrote that with the empty attribute value, and `HeadObject` never marked it at all, so neither reported a version id for an object put into a versioning-suspended bucket. Both now resolve it through a shared `liveObjVersionId`, which reports `null` only when the bucket has versioning configured so that a bucket that was never versioned keeps reporting no version id at all. `HeadObject` also resolved an explicit `?versionId=null` into the versioning directory twice, once for the missing attribute and once for the mismatch that followed from it, and answered `404` for a version that `GetObject` served. It now treats the missing attribute as the null version the way `GetObject` does. `latestObjVersion` took the last version directory entry as the newest, but `os.ReadDir` sorts by name and `null` sorts after every `ulid`. Deleting the current version of an object whose history also held a null version therefore restored `null` rather than the version created immediately before the deleted one. The `ulid` entries keep their name order, which is creation order, and the null version is placed by its modification time, the same rule `fileToObjVersions` already applies.