private static async Task <IQueue <TItem> > CloneAsync(IQueue <TItem> queue)
{
var cloneable = queue as ICloneable;
if (cloneable != null)
{
return((IQueue <TItem>)cloneable.Clone());
}
var clone = new Memory.Queue <TItem>();
await queue.CopyToAsync(clone).ConfigureAwait(false);
return(clone);
}