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Microsoft fixes the Excel feature that was wrecking scientific data
(www.theverge.com)
This is a most excellent place for technology news and articles.
Honestly, I'd say you shouldn't do that prompt method. The auto type is genuinely great for the use cases which Excel is supposed to be used for, from someone managing their household finances to charting the growth of a business.
By all means, it absolutely should make assumptions about your data by default, as that's incredibly convenient for the average user. You can always change the type of a cell afterwards if what you're doing is special.