I have created a directory flake that contains a binary.
I am installing it imperatively using
nix profile install /tmp/cool-thing.
When I run
nix profile history I see symbols:
Version 14 (2021-11-30) <- 13: path:/tmp/cool-thing#defaultPackage.x86_64-linux: ε -> ∅ Version 15 (2021-11-30) <- 14: path:/tmp/cool-thing#defaultPackage.x86_64-linux: ∅ -> ε
What do these pairs of symbols mean?
Also, what does each individual symbol signify? Guessing, they look like mathematical notation from set theory.
I am wondering aloud at why the UX encodes meaning using mathematical notation. I love the clarity of such notation. But I worry that other users may find it off putting (e.g. obscure, too complex).