code: func New(h crypto.Hash) *Isolated {
  	a := ""
  	switch h {
  	case crypto.SHA1:
  		a = "sha-1"
  	case crypto.SHA256:
  		a = "sha-256"
  	case crypto.SHA512:
  		a = "sha-512"
  	}
  	return &Isolated{
  		Algo:    a,
  		Version: IsolatedFormatVersion,
  		Files:   map[string]File{},
  	}
  }
docs: // New returns a new Isolated with the default Algo and Version.