When nixpkgs-26.05-darwin gets created, we'll get a bit hit by the mess which we have in the channel-blocking package sets, as here it contains some packages which do not block nixpkgs-unstable (no idea why, really).

In particular, gimp2 and cabal2nix will probably turn out problematic. Ref: https://hydra.nixos.org/job/nixpkgs/staging-next/darwin-tested#tabs-constituents

I suppose we mainly need to adjust the darwin channel-blocking package set, somehow.