docs: def all_query(expression):
      """Match arrays that contain all elements in the query."""
      def _all(index, expression=expression):
          """Return store key for documents that satisfy expression."""
          ev = expression() if callable(expression) else expression
          try:
              iter(ev)
          except TypeError:
              raise AttributeError('$all argument must be an iterable!')
  
          hashed_ev = [index.get_hash_for(v) for v in ev]
          store_keys = set()
  
          if len(hashed_ev) == 0:
              return []
          store_keys = set(index.get_keys_for(hashed_ev[0]))
          for value in hashed_ev[1:]:
              store_keys &= set(index.get_keys_for(value))
          return list(store_keys)
  
      return _all