public static IActiveValue <bool> ActiveSetContains <TSource>(this IActiveSetList <TSource> source, IActiveValue <TSource> value) => new ActiveSetContains <TSource, TSource>(source, source, value);
public static IActiveValue <bool> ActiveSetContains <TSource>(this IActiveSetList <TSource> source, TSource value) => ActiveSetContains(source, new ActiveValueWrapper <TSource>(value));