code: func (db *DB) minSeq() uint64 {
  	db.snapsMu.Lock()
  	defer db.snapsMu.Unlock()
  
  	if e := db.snapsList.Front(); e != nil {
  		return e.Value.(*snapshotElement).seq
  	}
  
  	return db.getSeq()
  }
docs: // Gets minimum sequence that not being snapshotted.