FsCodec.SystemTextJson by @jet @moneylion @amjjd @bartelink @eiriktsarpalis and contributors

<PackageReference Include="FsCodec.SystemTextJson" Version="3.0.3" />

.NET API 72,192 bytes

TypeSafeEnumConverter<T>

public class TypeSafeEnumConverter<T> : JsonConverter<T>

Maps strings to/from Union cases; refuses to convert for values not in the Union

public TypeSafeEnumConverter()