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Me before reading the article: It’s got to be dates. Excel thinks everything is a date.
Me after reading the article: Even the workaround is halfhearted. Jeebus.
Apart from actual dates.
Microsoft’s blog adds caveats, such as that Excel avoids the conversion by saving the data as text, which means the data may not work for calculations later. There’s also a known issue where you can’t disable the conversions when running macros.