hon</code> conversions from wrapped
      <code>T</code> instances to each of its exposed direct and indirect
      bases. For each polymorphic base <code>B</code>, registers conversions
      from indirectly-held wrapped <code>B</code> instances to
      <code>T</code>.</td>

      <td><code><a href="#bases-spec">bases&lt;&gt;</a></code></td>
    </tr>

    <tr>
      <td><code><font color="#007F00">HeldType</font></code></td>

      <td>Must be <code>T</code>, a class derived from <code>T</code>, or a
   