"Nix overlays: the fixpoint and the (over)layer cake" by @Layus

When thinking about how figures, graph, images, etc. can aid explaining a complex topic, the post Nix overlays: the fixpoint and the (over)layer cake by @layus comes to mind as a perfect example.

The TikZ code has also been kindly provided by @layus:


Notes to self:

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Great find! Would be awesome if we could transport some of that insight back into nixpkgs or at least the NixOS Wiki.