oto objects into Proto terminals. Its behavior is domain-specific. By default,
            non-Proto types are held wrapped by reference in a new Proto terminal expression, and
            objects that are already Proto expressions are simply returned by reference.
          </p>
<p>
            If <code class="computeroutput">Domain</code> is not explicitly specified, it is assumed to
            be <code class="computeroutput"><code class="computeroutput"><a class="link" href="default_domain.html" title="