when talking about 'backpressure' it is essential to distinguish whether we are talking about pull streams or push streams, and if the backpressure mechanism is

when talking about 'backpressure' it is essential to distinguish whether we are talking about pull streams or push streams, and if the backpressure mechanism is in-band or out-of-band. usually when we talk about a 'reactive stream' we are only talking about push streams, because if you are truly reactionary the consumer doesn't control the flow like a pull-based iterator does.