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History  In the response, the keystate field is intended to be a
bitmask for various states. For example: 0x80 = not found 0x00 =
found, not persisted 0x01 = found, persisted 0x810 = logically
deleted 0x81 = not found  This is primarily because replication
can potentially be significantly behind the initial create and
we do not want to receive a NOT_FOUND error for the entire set
of items being observed in that state. The intent of this being
a bitmask is that future extension could allow for this field to
indicate if the item is considered in any indexes, etc. Error
masks start from the top of the field.