docs: def delete(collection_name, spec, safe,
             last_error_args, opts, flags=0):
      """Get a **delete** message.
  
      `opts` is a CodecOptions. `flags` is a bit vector that may contain
      the SingleRemove flag or not:
  
      http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/#op-delete
      """
      data = _ZERO_32
      data += bson._make_c_string(collection_name)
      data += struct.pack("<I", flags)
      encoded = bson.BSON.encode(spec, False, opts)
      data += encoded
      if safe:
          (_, remove_message) = __pack_message(2006, data)
          (request_id, error_message, _) = __last_error(collection_name,
                                                        last_error_args)
          return (request_id, remove_message + error_message, len(encoded))
      else:
          (request_id, remove_message) = __pack_message(2006, data)
          return (request_id, remove_message, len(encoded))