code: func (s *Store) All() []*Future {
  	s.RLock()
  	defer s.RUnlock()
  
  	all := make([]*Future, 0, len(s.store))
  
  	for _, savedFuture := range s.store {
  		all = append(all, savedFuture)
  	}
  
  	return all
  }
docs: // All will return a slice with all stored futures.