Stamped value does not update as expected

[sorvell]

There appears to be a timing issue when data changes at a particular time. It's rather complicated but I boiled the issue down to this gist:

https://gist.github.com/sorvell/9243430

In the example, I expect that assert(obj.bar === true) will have true next to it. It does not.

[rafaelw]

Ok. I see the issue. You've found a very subtle bug that only affects Object.observe-mode and depends on exactly the timing you stumbled on. The bug is in the optimization that I put in to minimize calls to Object.observe.

I'm still pondering what the best fix is. The test case that will go with the fix is:

  test('issue-161', function(done) {
    var model = {};
    var ob1 = new PathObserver(model, 'obj.bar');
    var called = false
    ob1.open(function() {
      called = true;
    });

    var obj2 = new PathObserver(model, 'obj');
    obj2.open(function() {
      model.obj.bar = true;
    });

    model.obj = {};
    model.obj.foo = true;

    then(function() {
      assert.strictEqual(called, true);
      done();
    });
  });

[rafaelw]

Fixed: https://github.com/Polymer/observe-js/commit/3d7b5aa