I will edit my comments using the syntax used by @BurntSushi, namely U+FFFF instead of 0xFFFF.
Can you cite the exact passage on wikipedia you are referring to? The phrase "must never appear in a valid UTF-8 sequence" only shows up once, and it does not appear relevant.
The table in the wikipedia article is talking about "UTF-8 code units (individual bytes or octets)" not Unicode scalar values. So it means those bytes will never appear in UTF-8. Not that those unicode values will never appear.
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It doesn't say that. You are mixing up Unicode and its various encodings.
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Wow! I am brain dead. You've been saying this the whole time, and I finally understand what you mean. I'm very sorry for wasting your time. It clearly states above the table that it's talking about "UTF-8 code units". Thank you for your patience.
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Yes, it does indeed. I'm sorry about my brain fart.
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