code: func (c *MockClient) SetMulti(items []*Item) []MutateResponse {
  	c.mutex.Lock()
  	defer c.mutex.Unlock()
  
  	res := make([]MutateResponse, len(items))
  	for i, item := range items {
  		res[i] = c.setHelper(item)
  	}
  	return res
  }
docs: // Batch version of the Set method.  Note that the response entries
  // ordering is undefined (i.e., may not match the input ordering).