public static boolean equals(BitSet bs, MutableRoaringBitmap rr) {
final int[] a = new int[bs.cardinality()];
int pos = 0;
for (int x = bs.nextSetBit(0); x >= 0; x = bs.nextSetBit(x + 1)) a[pos++] = x;
return Arrays.equals(rr.toArray(), a);
}
