Thank you for the feedback. I agree with your point.

The current solution is to make pipeline stages context-aware (which is often happens automatically) and cancel the context before returning. This is the responsibility of the user and can lead to problems you described.

I haven't yet found a better solution to this. On the other hand, exact same thing happens if your function spawns a goroutine and returns. That goroutine would run until done, unless it's context aware.

Regarding the "Delay" and "infiniteBuffer" functions - these are part of the work on adding support for feedback loops to Rill. I haven't yet found a reliable and user friendly way to do it, so this work is on hold for now.