The existing text of the multi-server namespace chapter leaves too much leeway
for replicas that that may not have identical data. On the other hand,
restricting replicas to read-only never-changing data would be too restrictive.
We need to have appropriate constraints on replicas to prevent clients getting
confused while allowing clients to see consistent replicas that change with time
(time always going forward), both within a single period of access to replica
and across any transition between replicas.
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