I remember reading about one long ago, but don’t remember anything more. Google gave me https://marioskogias.github.io/docs/enclosure.pdf https://marioskogias.

I remember reading about one long ago, but don’t remember anything more. Google gave me https://marioskogias.github.io/docs/enclosure.pdf https://marioskogias.github.io/docs/enclosure.pdf. That isn’t what I saw then, but it does use R, RW, and RWX.