/// <summary>
/// Returns the value associated with the specified key, or None if no such key exists.
/// </summary>
/// <param name="key">The key.</param>
/// <returns></returns>
public override Optional <TValue> TryGet(TKey key)
{
return(Root.Find(key));
}
public Optional <TValue> TryGet(TKey k)
{
return(_inner.Find(k));
}