Root level init
        :return:

async def root(self):
        """
        Root level init
        :return:
        """
        if self.writing:
            await self.iobj.awrite(binascii.unhexlify(b'011673657269616c697a6174696f6e3a3a617263686976650000'))

        else:
            hdr = bytearray(2)
            await self.iobj.areadinto(hdr)
            if hdr != bytearray(b'\x01\x16'):
                raise ValueError('Unsupported header')

            hdr = bytearray(22)
            await self.iobj.areadinto(hdr)
            if hdr != bytearray(b'serialization::archive'):
                raise ValueError('Unrecognized magic header')

            tra = await load_uvarint(self.iobj)
            ver = await load_uvarint(self.iobj)
            if tra != 0:
                raise ValueError('Tracking not supported')