Hi there.

I've got a requirement for a flow to keep going when its upstream input 
completes/fails. I could write a custom flow stage and override 
onUpstreamFinish, but I was wondering if there were a means to express this 
just using the FlowOps API. FlowOps.detach got me excited, but that isn't 
quite what I expected. Also, buffer(0, OverflowStrategy.backpressure) 
looked as though it could do the job, but the buffer size must be positive.

Thanks for any assistance.

Kind regards,
Christopher

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