titanium.js

var oldThis = this;

// If the Ti object were definied in JS like this...
var Ti = {
    UI: {
        createView: function(args) {
            return new Ti.UI.View(args);
        },
        View: function(args) {
            if (!(this instanceof arguments.callee)) {
                return new arguments.callee(args);
            }
            // work with "this"...
        }
    }
};

//Prototype behavior remains intact...
Ti.UI.View.prototype.myStuff = 'myStuff';

//...and all these are valid:
var v1 = Ti.UI.createView({ backgroundColor:'#ff0000' });
var v2 = Ti.UI.View({ backgroundColor:'#ff0000' });
var v3 = new Ti.UI.View({ backgroundColor:'#ff0000' });

// new bug goes away....
console.log(v2.myStuff);
console.log(oldThis.myStuff);

We could probably remap the API and do this automagically in the compiler