How to use the is2.positiveInt function in is2

// the first arument may be an object, if it is not, make an object
    var opts;
    if (is.obj(port)) {
        opts = port;
    } else {
        opts = makeOptionsObj(port, host, inUse, retryTimeMs, timeOutMs);
    }

    //debug('opts:'+util.inspect(opts);

    if (!is.bool(opts.inUse)) {
        deferred.reject(new Error('inUse must be a boolean'));
        return deferred.promise;
    }

    if (!is.positiveInt(opts.retryTimeMs)) {
        opts.retryTimeMs = RETRYTIME;
        debug('set retryTime to default '+RETRYTIME+'ms');
    }

    if (!is.positiveInt(opts.timeOutMs)) {
        opts.timeOutMs = TIMEOUT;
        debug('set timeOutMs to default '+TIMEOUT+'ms');
    }

    function cleanUp() {
        if (timeoutId) {
            clearTimeout(timeoutId);
        }
        if (retryId) {
            clearTimeout(retryId);
        }

Discovery.prototype.update = function(name, userData, interval, available) {
    if (!is.nonEmptyStr(name)) {
        debug('update error: missing name: '+inspect(name));
        return false;
    }

    if (!userData) {
        debug('update error: no userData: what is being announced?');
        return false;
    }

    if (!is.positiveInt(interval))    interval = DEFAULT_INTERVAL;
    if (!available)    available = true;

    // make a copy of the userData object
    var userDataCopy = objToJson.copyObj(userData);
    if (!userDataCopy)    return false;

    // attempt to add the announcement return result to user
    return this.updateExisting(name, userDataCopy, interval, available);
};

opts = makeOptionsObj(port, host, inUse, retryTimeMs, timeOutMs);
    }

    //debug('opts:'+util.inspect(opts);

    if (!is.bool(opts.inUse)) {
        deferred.reject(new Error('inUse must be a boolean'));
        return deferred.promise;
    }

    if (!is.positiveInt(opts.retryTimeMs)) {
        opts.retryTimeMs = RETRYTIME;
        debug('set retryTime to default '+RETRYTIME+'ms');
    }

    if (!is.positiveInt(opts.timeOutMs)) {
        opts.timeOutMs = TIMEOUT;
        debug('set timeOutMs to default '+TIMEOUT+'ms');
    }

    function cleanUp() {
        if (timeoutId) {
            clearTimeout(timeoutId);
        }
        if (retryId) {
            clearTimeout(retryId);
        }
    }

    function timeoutFunc() {
        timedout = true;
        cleanUp();