If you used UTF-8 then you can probably fix those pretty easily. UTF-8 is sufficiently structured that it’s extremely unlikely for a string that’s written in another encoding to be valid UTF-8 by accident. If you write some code to try decoding as UTF-8 and set that as the encoding when it succeeds, you’re unlikely to damage anything in the process.
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If you used UTF-8 then you can probably fix those pretty easily. UTF-8 is sufficiently structured that it’s extremely unlikely for a string that’s written in another encoding to be valid UTF-8 by accident. If you write some code to try decoding as UTF-8 and set that as the encoding when it succeeds, you’re unlikely to damage anything in the process.