@type t() ::
%Envoy.Extensions.Quic.ServerPreferredAddress.V3.FixedServerPreferredAddressConfig{
__unknown_fields__: [
{field_number :: integer(), Protobuf.Wire.Types.wire_type(),
value :: term()}
],
ipv4_type: {:ipv4_address, String.t()} | nil,
ipv6_type: {:ipv6_address, String.t()} | nil
}