code: func (db *NodeSet) Get(key []byte) ([]byte, error) {
  	db.lock.RLock()
  	defer db.lock.RUnlock()
  
  	if entry, ok := db.nodes[string(key)]; ok {
  		return entry, nil
  	}
  	return nil, errors.New("not found")
  }
docs: // Get returns a stored node