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by passivegains 505 days ago
Apparently it relies on ECN, so that makes sense:

> It uses the Explicit Congestion Notification (ECN) protocol... Because ECN support is essential for L4S, senders use the ECN field as the protocol that allows the network to identify which packets are L4S and which are Classic.

https://datatracker.ietf.org/doc/rfc9330/