//Called through reflection
private static KeyValuePair <Type, UpconvertFunc> ToFuncFrom <TSource, TDestination>(IUpconvertEvent <TSource, TDestination> upconverter)
=> new KeyValuePair <Type, UpconvertFunc>(typeof(TSource), x => new UpconvertResult(new ItemWithType(
upconverter.Upconvert((TSource)x.instance))));
//Called through reflection
private static KeyValuePair <Type, UpconvertFunc> ToFuncFrom <TSource>(IUpconvertEvent <TSource> upconverter)
=> new KeyValuePair <Type, UpconvertFunc>(typeof(TSource), x => new UpconvertResult(
upconverter.Upconvert((TSource)x.instance).Select(i => new ItemWithType(i))));
