RFR: 8354522: Clones of DecimalFormat cause interferences when used concurrently [v6]

[Naoto Sato]

On Tue, 15 Apr 2025 22:21:31 GMT, Johannes Graham <duke at openjdk.org> wrote:

>> The `DigitList` class used in `DecimalFormat` does not reset the `data` array in its clone method. This can cause interference when clones are used concurrently.
>
> Johannes Graham has updated the pull request incrementally with one additional commit since the last revision:
> 
>   break after mismatch

I just wonder if we could do a white testing, ie, `df.digitList.data != df.clone().digitList.data` after `df.format(Math.PI)`

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PR Comment: https://git.openjdk.org/jdk/pull/24598#issuecomment-2807781536