Treating numerical values as text yields incorrect results, especially if those values are signed; therefore, the column text must be converted to a numerical type.
将数字作为文本对待会产生错误结果，尤其是当这些值是有符号数字时，因此，列文本必须转换为数字类型。
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Grady: This is the essence of treating architecture as an artifact and I've just written a multi-page article on that very topic for my column, on architecture, for IEEE software.