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SCTP over UDP is how WebRTC data channels get their configurable reliability and ordering.

I think the internet would have been a much better place if SCTP caught on 15 years ago. It solved so many problems way ahead of it's time. Ah well.

I looked into SCTP a bit. It seems to have a few quirks that puzzle me. E.g. the number of streams can be limited by what the underlying OS or other endpoint is willing to support. Not sure if that is what I want. I need to read a lot more to fully understand it.