 a copy or a reference to the returned object. In Boost.Python Version 2
      I have the choice of using copy_const_reference or
      return_internal_reference. Are there considerations that would lead me
      to prefer one over the other, such as size of generated code or memory
      overhead?</i>

      <p><b>A:</b> copy_const_reference will make an instance with storage
      for one of your objects, size = base_size + 12 * sizeof(double).
      return_internal_reference will make an instance with st