gistfile1.js

var dataPromise = new Y.Promise(function (resolve, reject) {
    var data = [];

    function getData(offset) {
        return new Y.Promise(function (dataResolve, dataReject) {
            Y.io('getdata.php?offset=' + offset, {
                on: {
                    success: function (id, response) {
                        var dataset = Y.JSON.parse(response.responseText);

                        data.push.apply(data, dataset);

                        dataResolve((dataset.length < 100) ? data : getData(offset + 100));
                    },
                    failure: function () {
                        dataReject(new Error("Oh noes!"));
                    }
                }
            });
        });
    }

    getData(0).then(resolve, reject);
});

dataPromise.then(function (allTheData) {
    // allTheData has ... all of the data
}, handleError);

I thought you knew everything ;)

You may be right.
On irc we discussed this as well and all say no memoryleaks to be expected.
I think I messed up: the promise may hold options, but GC issues would be expected the other way arround (when an external object were to hold the promise). At least, I think so...

Thx.