al
        times, so long as the structure has not changed since the skeleton was transferred.
        The skeleton/content mechanism can improve performance when the data structure
        is large and its shape is fixed, because while the skeleton requires serialization
        (it has an unknown size), the content transfer is fixed-size and can be done
        without extra copies.
      </p>
<p>
        To use the skeleton/content mechanism from Python, you must first register
        the type of your d