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That shows up as ₛᵖ.ⓜ, so a bunch of characters are missing.

HN seems to encode it as punycode when it shouldn’t; it skipped normalization.

Python 3 encodes the domain to xn--hkr-zdyy2ssn00g.mobi.

Not that that works.

Right, it needs to be normalized first. After normalization, there would only be ASCII left, so nothing would end up punycode-encoded