Handle mismatches between oplog + known ops #1
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The current implementation handles mismatches between the op-log and known set of operations quite badly.
It is required that the current op-log head points to a known and explicitly provided operation.
This can cause issues in the following scenarios:
Another issue exists as a result of this approach; information regarding the order in which operations were actually applied is lost. This may be distinct from the order in which operations were provided.
When executing in the :down direction it would be safer to execute in the reverse order to which operations were applied.
This commit resolves this issue by: