namespace System.Net.ClientModel.Internal
{
    [DefaultMember("Item")]
    public class OptionalDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IDictionary<TKey, TValue>, IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IReadOnlyDictionary<TKey, TValue>
        where TKey, notnull
    {
        public bool IsUndefined { get; }
    }
}