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The parent comment is specifically referring to creating a new branch from an existing branch with a slash in the name (ex: 'test-branch' and 'test-branch/new'). Trying it on my own machine (macos) yields an error. Even switching branches first and creating the new one yields an error.

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First ran into this on persistent servers, where the deployed instance knew branch names github had long forgotten about.. Someone pushed a branch named "bugfix", and `git fetch` started erroring.

You get even _more_ interesting problems if part of your team has case-insensitive file-systems!

You should find that vice versa also errors. After all, in principle I guess it's possible to store data in a directory (it looks like EXT2 in particular would let you store data in between entries, https://tldp.org/LDP/tlk/fs/filesystem.html#ext2fs-dir-figur... ), but the natural law is that a directory can't contain file contents.

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