</li>
<li>Automatic, efficient filters on your models that you can use to build
live arrays that match conditions on each record. For example, you
could build a live array that contained only <code>Person</code> records whose
last name was "Lannister" or whose <code>isSaving</code> flag was true. The
arrays are updated incrementally only when the properties change.</li>
<li>Support for several different kinds of relationships. Relationships
can be populated with an Array of IDs, a URL, or determined lazily
