plus above, an actor&lt;value&lt;T&gt; &gt; (where T is the type of the constant) is, by default, automatically created for us. For instance, the example plus above is actually equivalent to:</p>
<code><pre>
    <span class=identifier>plus</span><span class=special>(</span><span class=identifier>arg1</span><span class=special>, </span><span class=identifier>actor</span><span class=special>&lt;</span><span class=identifier>value</span><span class=special>&lt;</span><span class=keyword>int</span><span class=s