当使用64位测量时，一定要设置正确的比例和精度值。
When using 64 bit measures ensure appropriate scale and precision values are set.
一定要设置正确的比例和精度值。
因为每个计划项增加的字符串长度总数大体相同，所以随后的稳定期比例可以作为重新设置底层数组大小的参考指标。
Because each plan item increases the total string length by roughly the same amount, the ratio of subsequent plateaus provides an indicator of the resize factor for the underlying array.
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