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A readable PDF page is not a text extraction test

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A PDF screenshot can stay identical while the extracted words change. I tested that deliberately on September 30, 2026, using a small Chinese holiday notice. The page still said 放假, meaning a holiday or time off. Three text extractors returned 放真 after I changed one character mapping. That is a useful failure case for a document test suite: the output looks like ordinary text, so checks for empty strings and replacement characters will not catch it.

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