FsCodec by @jet @amjjd @bartelink @eiriktsarpalis and contributors

<PackageReference Include="FsCodec" Version="1.0.0-pr.19.rc2.4" />

.NET API 17,408 bytes

IIndexedEvent<Format>

public interface IIndexedEvent<Format> : IEvent<Format>

long Index { get; }

bool IsUnfold { get; }