Re: [quicwg/base-drafts] What can change in a different version (#55)

[Brian Trammell <[e-mail]>]

One suggestion here: the version number space could be defined such that the version number field appears as the first 32 bits of the packet if present; i.e. a valid version number & 0x01000000 == 0x01000000, such that the first N bits of the packet either look like:

```
+-------------+-+------------------------------------------------+
|             |1|      version                                   |
+-------------+-+------------------------------------------------+
| flags       |1|
+-------------+-+ ...
```

or

```
+-------------+-+
|   flags     |0|
+-------------+-+ ...
               ^-- version flag
```

(The current multi-varlen layout of the wire image still seems to me to be unnecessarily fiddly, but that's a larger issue that will receive a separate post to quic@)

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