Re: [quicwg/base-drafts] Don't retransmit lost packets that are acked later (#3957)

[Martin Thomson <[e-mail]>]

@martinthomson approved this pull request.

This is useful information and in the right place.  Thanks.

I have a small suggestion, but I'm OK with the original phrasing.

> +When a sender declares a packet as lost and either retransmits the contained
+frames or marks them for retransmission, the sender SHOULD avoid subsequent
+retransmission of this information if it later receives an acknowledgement for
+that packet. Doing so requires senders to retain information about packets after
+they are declared lost. A sender can discard this information after a period of
+time elapses, such as three times the PTO (Section 6.2 of {{QUIC-RECOVERY}}), or
+on other events, such as reaching a memory limit.

```suggestion
Acknowledgments can be received after a sender declares a packet as lost.  A
sender SHOULD avoid sending information again after receiving a late
acknowledgment. Doing so requires senders to retain information about packets
for some time after they are declared lost. A sender can discard this
information after a period of time elapses, such as three times the PTO (Section
6.2 of {{QUIC-RECOVERY}}), or on other events, such as reaching a memory limit.
```

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