Re: [quicwg/base-drafts] It's unclear if persistent congestion is a per-PN-space property (#3939)

[Kazuho Oku <[e-mail]>]

In #3889, @marten-seemann states:
>> When receiving an acknowledgement, mark a hole in the sentmap for the packet being acked.
> 
> I don't think that's trivial. Creating a "hole" is extra state that has to be cleaned up at some point.

It does not require additional state.

In QUIC, there is an expectation that packet numbers would be used sequentially, starting from zero. Therefore, a "gap" can be detected when iterating through the sentmap and if the packet number increases (or decreases) by more than one.

Note that endpoints are recommended to _treat receipt of an acknowledgment for a packet it did not send as a connection error of type PROTOCOL_VIOLATION, if it is able to detect the condition_ ([transport draft; section 13.1](https://quicwg.org/base-drafts/draft-ietf-quic-transport.html#section-13.1-3)) Therefore, when intentionally skipping a packet number, it is a good idea to have that recorded in the sentmap, and close the connection when the peer acks that skipped packet number.

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