Re: [quicwg/base-drafts] Why is ipAddress variable length (#2158)

[Kazuho Oku <[e-mail]>]

FWIW, in #2122 we are discussing about using the structure to send multiple entries of PreferredAddress (e.g., one that contains IPv4 address and the other containing a IPv6 address).

I'd assume that we would be doing either
```
PreferredAddress addresses<x..y>;
```
or
```
struct Address {
    enum { IPv4(4), IPv6(6), (15) } ipVersion;
    opaque ipAddress<4..2^8-1>;
    uint16 port;
}
struct PreferredAddress {
    AddressPort addresses<x..y>;
    ...
}
```

Either ways, the length of the IP address would be required to keep the structure extensible (i.e. allowing a new IP version to be defined).

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