RFR: 8368328: CompactNumberFormat.clone does not produce independent instances [v3]

[Raffaello Giulietti]

On Wed, 24 Sep 2025 23:07:54 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Fixing `CompactNumberFormat.clone()` to clone mutable reference objects. The bug was caused by accessing the shared objects concurrently which resulted in an illegal state on parsing. There are other reference fields that are shared, but the contents of those fields (such as prefix/suffix) are constants/read-only, so they may be shared.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fixing test comment

I think it would be useful to add a comment to each individual field that is a "read-only constant after initialization". This would make the intent explicit.

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PR Comment: https://git.openjdk.org/jdk/pull/27475#issuecomment-3333318630