public <T extends Comparable<T>> boolean evaluate(T left, T right) {
        Objects.requireNonNull(left);
        Objects.requireNonNull(right);
        return evaluate(left.compareTo(right));
    }
Returns true if 'left op right' is true, with 'op' being the operator represented by this.
flags/src/main/java/com/yahoo/vespa/flags/json/RelationalOperator.java