title: ActiveRecord::Store with default values
body: <p>Using the new ActiveRecord::Store for serialization, <a href="http://api.rubyonrails.org/classes/ActiveRecord/Store.html" rel="noreferrer">the docs</a> give the following example implementation:</p>
  
  <pre><code>class User &lt; ActiveRecord::Base
    store :settings, accessors: [ :color, :homepage ]
  end
  </code></pre>
  
  <p>Is it possible to declare attributes with default values, something akin to:</p>
  
  <pre><code>store :settings, accessors: { color: 'blue', homepage: 'rubyonrails.org' }
  </code></pre>
  
  <p>?</p>