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I did the much same thing (pbpaste | xxd), but don't understand how the hidden characters are tipping ChatGPT.

Seems like some encoding difference. You can see the hidden message if you read it as UTF-8: https://www.babelstone.co.uk/Unicode/whatisit.html?utf8=Past...

It’s non-printing Unicode tag block characters that correspond directly to ASCII and the AI is able understand them. It’s a deprecated feature of Unicode once used to encode the language of text, but now its only supported usage is in country flag emojis. See here for more detail: https://x.com/goodside/status/1745511940351287394

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