A note and another strategy for ID-based deduplication

[oggy-dfin]

Bogdan had a neat idea of how to extend the window-based ID deduplication approach. In the process of writing it up, I noticed that i didn't write anything about the backpressure when the capacity within the window is reached, so I added that.

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[robin-kunzler]

Thanks a lot for improving this further @oggy-dfin and @bogwar for the nice idea! Approving - only had a minor suggestion, see above.