code: func Open(location string) (*Lowlevel, error) {
  	opts := &opt.Options{
  		OpenFilesCacheCapacity: dbMaxOpenFiles,
  		WriteBuffer:            dbWriteBuffer,
  	}
  	return open(location, opts)
  }
docs: // Open attempts to open the database at the given location, and runs
  // recovery on it if opening fails. Worst case, if recovery is not possible,
  // the database is erased and created from scratch.