Re: [quicwg/base-drafts] Receiver's behavior on key update (#2791)

[David Schinazi <[e-mail]>]

@kazuho Thanks, I like the text referring to key phases and corresponding keys rather than keys directly.

However, you've dropped the requirement to immediately perform a key update when you unprotect with the next key phase. How about changing the start of the second to last paragraph to something like:

```
If the packet can be unprotected using the next receive key and IV, then the
endpoint switches to the next key phase: both send and receive keys associated
with the next key phase become current. The next packet sent by the endpoint
MUST then use the new send key. Once an endpoint has sent a packet...
```

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