mori-test.js

        function log() {
            console.log(mori.hash(xs), mori.count(xs));
        }

        var xs = mori.vector(1, 2);
        log(); // 1185709346 2
        xs = mori.remove(function (x) { return x === 2 }, xs);
        log(); // -1939225835 1
        xs = mori.conj(xs, 3);
        log(); // -1144666071 2
        xs = mori.conj(xs, 4);
        log(); // -1144666071 3