Tracking .NET Core < 5 gives exception

[Hertzole]

I want to track .NET Core 2.1 and 3.1 (for legacy reasons), but if I do dnvm track 3.1, I just get an exception.

dnvm 1.1.1 d30107df

Found latest version: 3.1.426
Unhandled exception. Serde.DeserializeException: Not all members were assigned.
   at Serde.DeserializeException.UnassignedMember() + 0x2b
   at Dnvm.ChannelReleaseIndex.Release._SerdeObj.Serde.IDeserialize<Dnvm.ChannelReleaseIndex.Release>.Deserialize(IDeserializer) + 0x57c
   at Serde.BoxProxy.De`2.Deserialize(IDeserializer) + 0x21
   at Serde.Json.JsonDeserializer`1.DeCollection.ReadValue[T](ISerdeInfo, Int32, IDeserialize`1) + 0x1c
   at Serde.BoxProxy.De`2.Deserialize(ITypeDeserializer, ISerdeInfo, Int32) + 0x49
   at Serde.DeListBase`6.Deserialize(IDeserializer) + 0x77
   at Dnvm.EqArrayProxy.De`2.Serde.IDeserialize<Dnvm.EqArray<T>>.Deserialize(IDeserializer) + 0x3b
   at Serde.BoxProxy.De`2.Deserialize(IDeserializer) + 0x3f
   at Dnvm.ChannelReleaseIndex._SerdeObj.Serde.IDeserialize<Dnvm.ChannelReleaseIndex>.Deserialize(IDeserializer) + 0x17e
   at Serde.Json.JsonSerializer.Deserialize_Unsafe[T](Byte[], IDeserialize`1) + 0x4a
   at Dnvm.InstallCommand.<TryGetReleaseFromIndex>d__5.MoveNext() + 0x81
--- End of stack trace from previous location ---
   at Dnvm.TrackCommand.<InstallLatestFromChannel>d__12.MoveNext() + 0x177
--- End of stack trace from previous location ---
   at Dnvm.TrackCommand.<Run>d__11.MoveNext() + 0x1c3
--- End of stack trace from previous location ---
   at Dnvm.Program.<Dnvm>d__3.MoveNext() + 0x337
--- End of stack trace from previous location ---
   at Dnvm.Program.<Main>d__1.MoveNext() + 0x198
--- End of stack trace from previous location ---
   at Dnvm.Program.<Main>(String[] args) + 0x2b
zsh: IOT instruction (core dumped)  dnvm track 3.1

Tracking 5.0 and above seems to work just fine.

[agocke]

Huh, looks like the old index files in the official .NET index do not have the same format as 5+. I'd have to go through and figure out what's different about the old files.