All of those except the last one are pretty obvious, especially if you're mixing... | Hacker News

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		userbinator on Jan 1, 2018 \| parent \| context \| favorite \| on: Zero-Width Characters: Invisibly fingerprinting te... All of those except the last one are pretty obvious, especially if you're mixing them to "communicate a single bit". Speaking of quotation marks, the non-ASCII quotes in your second item and apostrophe in the last sentence stand out too.

Too on Jan 1, 2018 [–]

They are obvious if you have two copies and are actively looking for differences, otherwise not. If someone sent me a document with square brackets somewhere i wouldn't question their use of square brackets over parenthesis, unless they don't match.

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