code: func NewConf(blockStorageDir string, maxBlockfileSize int) *Conf {
  	if maxBlockfileSize <= 0 {
  		maxBlockfileSize = defaultMaxBlockfileSize
  	}
  	return &Conf{blockStorageDir, maxBlockfileSize}
  }
docs: // NewConf constructs new `Conf`.
  // blockStorageDir is the top level folder under which `FsBlockStore` manages its data