Yield a number of raw items from the CryoTank starting at a given offset.

        Args:
            offs (int): The index of the desired datum (starts at 0)
            size (int): The max number of items to yield.

        Yields:
            ((indx, bytes)): Index and msgpacked bytes.

async def rows(self, offs, size=None, iden=None):
        '''
        Yield a number of raw items from the CryoTank starting at a given offset.

        Args:
            offs (int): The index of the desired datum (starts at 0)
            size (int): The max number of items to yield.

        Yields:
            ((indx, bytes)): Index and msgpacked bytes.
        '''
        if iden is not None:
            self.setOffset(iden, offs)

        for i, (indx, byts) in enumerate(self._items.rows(offs)):

            if size is not None and i >= size:
                return

            yield indx, byts