<code>defaultSerializer</code> property can be used to specify the serializer
that will be used by this adapter. This is only used when a model
specific serializer or <code>serializer:application</code> are not defined.</p>
<p>In an application, it is often easier to specify an
<code>serializer:application</code>. However, if you are the author of a
community adapter it is important to remember to set this property to
ensure Ember does the right thing in the case a user of your adapter
does not specify an <