@edolstra in #4061 you stated that this is probably not a good idea due to its ambiguity. As an alternative to this patch, would it make sense to improve the error to explicitly mention the workaround? Just having an invalid URL-error in that case is probably kinda confusing.

@edolstra may I ask what's your opinion re my previous comment?

If you keep only the regex change, does it work for the ?ref= case? That doesn't seem as ambiguous to me.

Seems fine as well. @edolstra wdyt?

cc @edolstra how shall we proceed here?

Thanks. I was worried that it might introduce ambiguities in the other fetchers but that appears not to be the case.

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/flake-input-schema-slash-in-branch-name/11396/5