Main blobbing
        :param elem:
        :param elem_type:
        :param params:
        :return:

async def blobize(self, elem=None, elem_type=None, params=None):
        """
        Main blobbing
        :param elem:
        :param elem_type:
        :param params:
        :return:
        """
        if self.writing:
            await self.field(elem=elem, elem_type=elem_type, params=params)
            return bytes(self.iobj.buffer)
        else:
            return await self.field(elem=elem, elem_type=elem_type, params=params)