code: async def sdiffstore(self, dest, keys, *args):
          
          res = await self.sdiff(keys, *args)
          await self.delete(dest)
  
          if not res:
              return 0
          return await self.sadd(dest, *res)
docs: Store the difference of sets specified by ``keys`` into a new
          set named ``dest``.  Returns the number of keys in the new set.
          Overwrites dest key if it exists.
  
          Cluster impl:
              Use sdiff() --> Delete dest key --> store result in dest key