v2.0.0-alpha.9

Breaking changes

• Improve set method.
  • Atomic change events.
  • Support nested events.
  • Fix previous object.
  • Change change event listener attributes:

      // Before:
      onChange(model, key, value) {}
      // Now:
      onChange(model, changed, ...args) {}
    

Chores

• Add test.
• Update modules.