https://lists.gnu.org/archive/html/emacs-bug-tracker/2019-11/msg00569.html
https://guix.gnu.org/cookbook/en/html_node/Basic-setup-with-manifests.html
https://github.com/fonsp/Pluto.jl#built-in-package-manager
https://mybinder.readthedocs.io/en/latest/tutorials/reproducibility.html#pin-dependencies