Better to use `final` instead of `prev` in overlay?

[CHN-beta]

Thanks for your great work, it helps me a lot 😺

I have an issue when using the overlay.

Currently, when packages not available in nixpkgs was introduced (e.g., smooth-video-player, svp), callPackage from prev instead of final was used. This makes the final package dependent on the order of the overlays.

nur-packages/flake.nix

Line 103 in 3dc4944

pkgs = prev;

For example, ffmpeg should be patched to work on my machine. Thus, to make svp works on my machine, I have to ensure the overlay from this repository is applied after my overlay (which overrides ffmpeg), which is quite confusing and annoying.

Is it better to use final when introducing new packages, and only use prev when overriding existing packages (e.g., python3) ?

p.s. same issue in cachyos kernel overlay.

[xddxdd]

Thanks for your suggestion. Unfortunately, every time I try to use final instead of prev here I get infinite recursion error while evaluating my system config.