It should be pointed out that the most relevant part of the implementation is in a change to Nix: Add optional `date` argument to `builtins.fetchGit` by Gabriella439 · Pull Request #7362 · NixOS/nix · GitHub. Basically, for this feature to be useful we would need to allow a new kind of impurity in builtins.fetchGit. I personally think it may be problematic adding a date argument to fetchGit as it may very well be too enticing.
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