递增基数是税务专业名词，意思是指财产被出售时用以确定利润或者损失的一个数值。
在未来的CE发行版中，以1作为递增基数可能会发生改变，尽管递增的行为没有改变。
It's possible that the increment-by-one behavior could change in a future CE release, though it would still be monotonically increasing behavior.
注意：默认使用字符串键，如果要使用数值键则需要重新指定，且从“0”开始以基数“1”递增。
Note: String keys will be maintained, but numeric keys will be re-indexed, starting at 0 and increase by 1.
提示：返回的数组将拥有数值键，从0开始以基数1递增。
Tip: The returned array will have numeric keys, starting at 0 and increase by 1.
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