/// <summary>
/// Asynchronously sneds a removal notification to the listener.
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="cause"></param>
internal virtual void NotifyRemoval(K key, V value, RemovalCause cause)
{
Task.Run(() => RemovalListener.OnRemoval(key, value, cause));
}
public void OnRemoval(K key, V value, RemovalCause cause)
{
@delegate.OnRemoval(key, value, cause);
}