t = db.geo_box2;

t.drop();

for (i = 1; i < 10; i++) {
    for (j = 1; j < 10; j++) {
        t.insert({loc: [i, j]});
    }
}

t.ensureIndex({"loc": "2d"});
assert.eq(9, t.find({loc: {$within: {$box: [[4, 4], [6, 6]]}}}).itcount(), "A1");

t.dropIndex({"loc": "2d"});

t.ensureIndex({"loc": "2d"}, {"min": 0, "max": 10});
assert.eq(9, t.find({loc: {$within: {$box: [[4, 4], [6, 6]]}}}).itcount(), "B1");