Method modulo

src/main/java/org/dynjs/runtime/Types.java:351–355

(long a, long b)

    }

    public static long modulo(long a, long b) {
        // because Java modulo doesn't deal with negatives the way the
        // javascript spec assumes it should.
        return (a % b + b) % b;
    }

    public static Long toInt32(ExecutionContext context, Object o) {
        Number number = toNumber(context, o);