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* CORDA-1645: Checkpoint before calling an idempotent sub-flow. When an idempotent sub-flow causes a flow restart, the flow will be replayed from the last checkpoint before the sub-flow invocation. However, the logic between the last checkpoint and the sub-flow invocation may contain side-effects which shouldn't be replayed. Thus we need to persist a checkpoint just before an idempotent sub-flow is invoked.