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Thanks a lot, this is great!

Something I'd like to also know is what happens if the submodule is 'hidden', and the URL starts with a .. This would mean the submodule resides within the parent repository, but is added as submodule under a different path.
Is this is a thing even? If you think so, please do feel free to contribute the respective test as well, but let's not block this PR on such an edge-case.