I've posted a longer explanation in https://news.ycombinator.com/item?id=44991638. I'm interested to hear which kernel and which firesystem zimpenfish is using that has this problem.

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yencabulator 2 days ago | parent [-]

I believe macOS forces UTF-8 filenames and normalizes them to something near-but-not-quite Unicode NFD.

Windows doing something similar wouldn't surprise me at all. I believe NTFS internally stores filenames as UTF-16, so enforcing UTF-8 at the API boundary sounds likely.

	▲	kragen 2 days ago \| parent [-]
		That sounds right. Fortunately, it's not my problem that they're using a buggy piece of shit for an OS.