圖像來源，Muskaan Kataria
Automatic type support: Caxlsx will automatically determine the type of data you are generating. In this release Float, Integer, String, Date, Time and Boolean types are automatically identified and serialized to your spreadsheet.
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in any of the layers，这一点在谷歌中也有详细论述
return fn(x: int) - int { return x + n; };