Internal
A thing which contains a timeline reference, and an index into it.
Optional
Try move the index forward, or into the neighbouring timeline
number of events to advance by
number of events successfully advanced by
the maximum possible value for the index in the current timeline (exclusive - ie, it actually returns one more than the index of the last element).
the minimum possible value for the index in the current timeline
Try move the index backwards, or into the neighbouring timeline
number of events to retreat by
number of events successfully retreated by
A thing which contains a timeline reference, and an index into it.