/// <summary>
/// Creates a new Headers object wih content copied from another dictionary.
/// </summary>
/// <param name="headers">Source dictionary to copy from.</param>
private Headers(IEnumerable<KeyValuePair<string, object>> headers)
{
_items = ImmutableLinkedList<KeyValuePair<string, object>>.FromEnumerable(headers);
}
private Stacktrace(IImmutableLinkedList<IProcessor> frames)
{
_frames = frames;
}