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a59fd5865d
The fs log btrees have values that start with a header that stores the item's seq and flags. There's a lot of sketchy code that manipulates the value header as items are passed around. This adds the seq and flags as core item fields in the btree. They're only set by the interfaces that are used to store fs items: _insert_list and _merge. The rest of the btree items that use the main interface don't work with the fields. This was done to help delta items discover when logged items have been merged before the finalized lob btrees are deleted and the code ends up being quite a bit cleaner. Signed-off-by: Zach Brown <zab@versity.com>