This means that it treats packages like values in purely functional programming languages such as Haskell ??? they are built by functions that do not have side-effects, and they never change after they have been built. ??? ???About Nix???, Nix and Hydra, like Charon, revolve around Pluto in the direction of Pluto's own rotation about its axis.[10] Nix' orbit is very nearly circular, and its siderea