@Override
    public NumericInItem clone() {
        NumericInItem clone = (NumericInItem)super.clone();
        clone.tokens = new HashSet<>(tokens);
        return clone;
    }
Class representing an IN operator with a set of 64-bit
integer values.

@author toregge
container-search/src/main/java/com/yahoo/prelude/query/NumericInItem.java