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

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

.NET API 17,408 bytes

IndexedEventData<Format>

public class IndexedEventData<Format> : IIndexedEvent<Format>

public static IndexedEventData<Format> Create(long index, string eventType, Format data, FSharpOption<Format> meta, FSharpOption<DateTimeOffset> timestamp, FSharpOption<bool> isUnfold)