 level traits - or not
serializing via a pointer.
</dd>

<dt><h2><a name="pointer_tracking">pointer_tracking</a> - warning</h2></dt>
<dd>
Serializing an object of a type marked "track_never" through a pointer
could result in creating more objects than were saved! There are cases
in which a user might really want to do this so we leave it as a warning.
</dd>

<dt><h2><a name="const_loading">const_loading</a> - error</h2></dt>
<dd>
One cannot load data into a "const" object unless it's a
wrapper around some o