code: def array_addunique(path, value, create_parents=False, **kwargs):
      
      return _gen_4spec(LCB_SDCMD_ARRAY_ADD_UNIQUE, path, value,
                        create_path=create_parents, **kwargs)
docs: Add a new value to an array if the value does not exist.
  
      :param path: The path to the array
      :param value: Value to add to the array if it does not exist.
          Currently the value is restricted to primitives: strings, numbers,
          booleans, and `None` values.
      :param create_parents: Create the array if it does not exist
  
      .. note::
  
          The actual position of the new item is unspecified. This means
          it may be at the beginning, end, or middle of the existing
          array)
  
      This operation is only valid in :cb_bmeth:`mutate_in`.
  
      .. seealso:: :func:`array_append`, :func:`upsert`