RFR: 8365832: Optimize FloatingDecimal and DigitList with byte[] and cleanup [v6]

[Chen Liang]

On Wed, 20 Aug 2025 21:25:33 GMT, Thomas Zimmermann <duke at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   without copy digits, from @j3graham
>
> I'm not an official reviewer, but looks good to me 👍 
> 
> P.S.: While looking why you might have preferred `ISO_8859_1` over `US_ASCII` (latin1 can skip the mapping of replacement characters because it defines the entire byte range, correct?), I stumbled upon a reference to the removed `SecurityManager` in [a comment](https://github.com/openjdk/jdk/blob/master/src/java.base/share/classes/java/lang/String.java#L652).

@zimmi, I created a simple issue for this outdated comment at https://bugs.openjdk.org/browse/JDK-8365887

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PR Comment: https://git.openjdk.org/jdk/pull/23311#issuecomment-3208202488