/// <summary>
/// Puts multiple entries for given key to builded ImmutableMultiDictionary.
/// </summary>
/// <param name="key">Entry key</param>
/// <param name="values">Entry values</param>
/// <returns>Builder</returns>
public AbstractImmutableListMultiDictionaryBuilder <T, TV, TR> PutAll(T key, IEnumerable <TV> values)
{
dictionary.PutAll(key, values);
return(this);
}