Agreed, but this will already severely cut the time window during which the 1st open can raise from the dead (from TCP retry timeouts to practical packet time of flight on the network). In Linux, the default TTL is 64, so a mourning period of 64s would ensure that an in-flight packet will not pop up. As this number is used for both seconds and hops count, we can hardly lower it. I suspect the practical value of this mourning is much lower, of the order of a few seconds if not less (but that's not fully rigorous).
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