public SelectMany(Serializer<T> input, Serializer<U> output, Func<dynamic, IEnumerable<U>> selector)
{
this.input = input;
this.output = output;
this.selector = selector;
}
public SelectOne(Serializer<T> input, Serializer<U> output, Func<dynamic, U> selector)
{
this.input = input;
this.output = output;
this.selector = selector;
}