Can't upgrade Deno from 1.3.3 to 1.8.3 by updating the sources and hashes in the derivation, as is normal procedure. `fetchFromGitHub` and friends fail to recursively fetch commits that are not visible from `HEAD` (`git clone` works), and I'm completely at a loss about how to debug this.

This kind of breaks. For people like myself who already spend a lot of time debugging dependency and compatibility issues in less sound package ecosystems (scripting languages I'm looking at you), Nix alternates between enlightening and maddening. Which I like.

The latest version of something failing to build. Like when the Tor project removes a Tor Browser package from its servers and `tor-browser-bin` hasn't yet been updated in nixpkgs.