Re: [quicwg/base-drafts] Add some MUSTs to congestion control (#3978)

[Jana Iyengar <[e-mail]>]

@janaiyengar commented on this pull request.



>  
 ## Congestion Avoidance
 
-Slow start exits to congestion avoidance.  Congestion avoidance uses an
-Additive Increase Multiplicative Decrease (AIMD) approach that increases
-the congestion window by one maximum packet size per congestion window
-acknowledged.  When a loss or ECN-CE marking is detected, NewReno halves
-the congestion window, sets the slow start threshold to the new
-congestion window, and then enters the recovery period.
+Congestion avoidance uses an Additive Increase Multiplicative Decrease (AIMD)
+approach that typically increases the congestion window by one maximum datagram
+size per congestion window acknowledged, and MUST NOT increase the congestion

It does not, since this document allows an endpoint to implement a different controller than the one specified here. See [Section 7](https://quicwg.org/base-drafts/draft-ietf-quic-recovery.html#section-7-3):
```
If an endpoint uses a different controller than that specified in this document, the chosen controller MUST conform to the congestion control guidelines specified in Section 3.1 of [RFC8085].
```

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