/// <summary>
/// Gets value from chain.
/// </summary>
/// <param name="id">identifier of queried value</param>
/// <returns>the value</returns>
public T Get(uint id)
{
T t = SafeGet(_second, id);
if (!EqualityComparer <T> .Default.Equals(t, default(T)))
{
_first.Set(id, t);
}
return(t);
}
