public void remove(int v) {
float x = x(v);
float y = y(v);
Bucket bucket = leaf(x, y).bucket;
// The default return value for bucket.dupes is set to bucket.singles.
// See note in add() for the reasoning behind this confusing choice.
//
long xyKey = xyToKey(x, y);
IntsArray vs = bucket.dupes.get(xyKey);
vs.remove(v);
if (vs != bucket.singles && vs.n == 0) bucket.dupes.remove(xyKey);
}
