@Override
    public XorFunction copy() {
        return new XorFunction(getLabel(),
                               getLevelOrNull(),
                               args().stream().map(arg -> arg.copy()).toList());
    }
Constructs a new instance of this class.

@param arg1 The first compulsory argument, must evaluate to a long.
@param arg2 The second compulsory argument, must evaluate to a long.
@param argN The optional arguments, must evaluate to a long.
container-search/src/main/java/com/yahoo/search/grouping/request/XorFunction.java