d1a4769b38
Except: - Instances in documentation, because people in older versions can't switch to nixfmt yet due to it having pointed to nixfmt-classic before - In code that runs based on a CI Nixpkgs version, which is also a bit older still - In update script shebangs, because many of them don't pin Nixpkgs, and run with whatever is in NIX_PATH (and it's not easy to fix this, see https://github.com/NixOS/nixpkgs/issues/425551)