Problem: we are fetching full git repos

[clacke]

A shallow clone of racket is 10 MB, a full clone is 170 MB.

The way I read nix-prefetch-git is that it is supposed to make a shallow clone unless you tell it otherwise, but evidence shows otherwise.

Solution: Call nix-prefetch-git --no-deepClone, and figure out a way to do the same in the nix expression. Is giving it deepClone = false enough, or is that getting overridden somewhere?