public void AddRange(InputMap <V> values)
{
var inputDictionary = (Input <ImmutableDictionary <string, V> >)_outputValue;
_outputValue = Output.Tuple(inputDictionary, values)
.Apply(x => x.Item1.AddRange(x.Item2));
}
/// <summary>
/// Note: this is non-standard convenience for use with collection initializers.
/// </summary>
public void Add(InputMap <V> values)
{
AddRange(values);
}