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Bug report: Error when writing NaN #30
Excel found unreadable content in 'foo.xlsx'. Do you want to recover the contents of this workbook? If you trust the source of this workbook, click Yes.
Even assuming this warning isn't intimidating to the end user, and they go ahead and recover, the affected cell apparently becomes 'nan' (losing any capitalization).
Obviously this can be worked around by checking the data beforehand and using
Also, I don't know what the proper course of action is when a true numeric NaN shows up. (Perhaps somehow write