Return either this GPflow objects requires compilation at decoding time.

        :param item: GPflow parameter.
        :return: None or True value.

def _take_extras(self, item: Parameter) -> Optional[bool]:
        """Return either this GPflow objects requires compilation at decoding time.

        :param item: GPflow parameter.
        :return: None or True value.
        """

        index = item.tf_compilation_index()
        if index is not None:
            if item.index == index:
                return True
            _add_index_to_compilations(self.context, index)
        return None