applyStatus method
lean applyDelta: apply iff sequential, otherwise fail closed.
Implementation
DeltaApplyStatus applyStatus(Epoch lastEpoch) => isNextAfter(lastEpoch)
? DeltaApplyStatusApply(epoch)
: DeltaApplyStatusResyncRequired(
lastEpoch: lastEpoch, baseEpoch: baseEpoch, epoch: epoch);