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c13df75243
Add checks for split variant inputs when accessing the payload contents via the accessor instance. Both cases, accessing via the safe `contents` method and via the previousely unsafe `open_contents_at_range` call are covered. Reduce possible misuse by wrapping the current plain content range into an opaque `ContentRange` type with an additional optional payload reference field to check consistency between the payload reference encoded in the metadata archive and the payload header' found in the payload data archive. Because of the additional type wrapping and the payload header check, the `open_contents_at_range` is considered safe now, dropping the previously unsafe implementation. The corresponding interfaces have been adapted accordingly. Signed-off-by: Christian Ebner <c.ebner@proxmox.com>