Let T be the target S2CellId. If T is contained by some index cell I
(including equality), this method positions the iterator at I and
returns INDEXED. Otherwise if T contains one or more (smaller) index
cells, it positions the iterator at the first such cell I and returns
SUBDIVIDED. Otherwise it returns DISJOINT and leaves the iterator
positioned arbitrarily.
Let T be the target S2CellId. If T is contained by some index cell I (including equality), this method positions the iterator at I and returns INDEXED. Otherwise if T contains one or more (smaller) index cells, it positions the iterator at the first such cell I and returns SUBDIVIDED. Otherwise it returns DISJOINT and leaves the iterator positioned arbitrarily.