Overlay

[jbboehr]

I was experimenting with packaging a Go program recently I noticed gomod2nix was using an overlay for it's own copy of nixpkgs, which, after a cursory browse of the source, seems unnecessary. Have you thought about removing it?

See: nix-community/poetry2nix@05b788f / https://zimbatm.com/notes/1000-instances-of-nixpkgs

[overlays] have a real performance impact as each flake would introduce its own instance of nixpkgs, which can further multiply if these flakes are than import into multiple NixOS configurations

As an idea, perhaps expose buildGoApplication and mkGoEnv on a lib attribute like: https://github.com/cachix/pre-commit-hooks.nix/blob/5668d079583a5b594cb4e0cc0e6d84f1b93da7ae/flake.nix#L51

Hope I didn't come off as too critical - just an idea for the idea bin.