ReadonlyfetchedFeatures the source returned across every page — before the cap.
ReadonlydeliveredFeatures actually handed to onPage — after the cap.
Optional ReadonlytruncatedPresent, and only present, when the cap cut the run short.
ReadonlyabortedTrue when the caller's signal was raised: the run is PARTIAL.
ReadonlylastCursor of the page never fetched, or null when the source was exhausted.
Optional ReadonlycursorPresent, and only present, when the caller's followCursor refused a cursor: the run
is PARTIAL, and lastCursor is the URL that was not followed.
What a full pagination run observed.