Use case for valueForUndefinedKey error raised on simple close call to Window

value_for_undefined_key.js

var win = Titanium.UI.createWindow({
  fullscreen: true,
  backgroundColor: '#666',
  url: 'value_for_undefined_key_subwindow.js'
});
win.addEventListener('ready', function() {
  // win.close causes an error only if called immediately after window is created
  win.close();
});

var button = Titanium.UI.createButton({
  title: 'Show Window',
  width: 300,
  height: 40
});
button.addEventListener('click', function() {
  win.open();
});

var label = Titanium.UI.createLabel({
  text: 'Press that button a few times and watch it crash',
  color: '#000',
  height: 'auto',
  bottom: 40
});

Titanium.UI.currentWindow.add(label);
Titanium.UI.currentWindow.add(button);

value_for_undefined_key_subwindow.js

Titanium.UI.currentWindow.fireEvent('ready');