Git clone latest Drupal code git clone --branch 8.0.x http://git.drupal.org/p...

1. Git clone latest Drupal code git clone --branch 8.0.x http://git.drupal.org/project/drupal.git
2. Git clone latest composer_manager module code git clone --branch 8.x-1.x http://git.drupal.org/project/composer_manager.git
3. Execute php modules/composer_manager/scripts/init.php, composer drupal-update (as per https://github.com/commerceguys/commerce#installation)
4. Git clone latest address module code git clone --branch 8.x-1.x http://git.drupal.org/project/address.git
5. Enable address module
6. Create new content type
7. Add address field (default settings)
8. Add number integer field (make it required)
9. Go to add content page of that content type
10. Select any country

Expected behavior:
Address fields appear based on the selected country, and no PHP warnings are logged.
Current behavior:
The address fields will not appear, and you will see PHP warnings and error in recent log message.

Now:

1. Change the number field and make it unrequired
2. Go to add content page of that content type
3. Select any country

Observation:
Address fields appear based on the selected country, and no PHP warnings are logged.