(function(){
    var collected = {}, storage = {};

    var get = function(uid){
        return (storage[uid] || (storage[uid] = {}));
    };

    var purge = function(){
        Hash.each(collected, clean);
        if (Browser.ie) Array.from(document.getElementsByTagName('object')).each(clean);
        if (window.CollectGarbage) CollectGarbage();
        collected = storage = null;
    };

    [Element, Window, Document].invoke('implement', {
        retrieve: function(property, dflt){
            var storage = get(this.uid), prop = storage[property];
            if (dflt != undefined && prop == undefined) prop = storage[property] = dflt;
            return prop != null ? prop : null;
        },
        store: function(property, value){
            var storage = get(this.uid);
            storage[property] = value;
            return this;
        },
        eliminate: function(property){
            var storage = get(this.uid);
            delete storage[property];
            return this;
        }
    });

    window.addListener('unload', purge);
})();