dType">HeldType Semantics</a></h4>

  <ol>
    <li>If <code>HeldType</code> is derived from T, its exposed
    constructor(s) must accept an initial <code>PyObject*</code> argument
    which refers back to the Python object that contains the
    <code>HeldType</code> instance, as shown in <a href=
    "call_method.html#examples">this example</a>. This argument is not
    included in the <em><a href=
    "init.html#init-expressions">init-expression</a></em> passed to <a href=
    "#class_-spec-modifiers"><co