Index also stable nixpkgs, or document in README that the index is for unstable

[sliedes]

Problem

My analysis here might be wrong, but I think this is what is happening:

• I'm running nixos-24.05
• I added the nix-index-database flake and set programs.nix-index-database.comma.enable = true

Now there are some failure cases:

[sliedes@poyta:~]$ , python3.12
error: unable to execute 'python3.12': No such file or directory

[sliedes@poyta:~]$ , -p python3.12
Package that contains executable /bin/python3.12: python3
error: unable to execute 'python3.12': No such file or directory

[sliedes@poyta:~]$ , python3
Python 3.11.9 (main, Apr  2 2024, 08:25:04) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

I believe the issue here is that in nixpkgs unstable, the package python3 contains Python 3.12, so the python3.12 binary is there; however, in stable, python3 is still Python 3.11.

Suggestions

While it would be nice to index and handle stable too, I think a minimal improvement would be to add a note about this in the README so people know what to expect.