RFR: 8367324: Avoid redundant parsing when formatting with DigitList [v5]

[Raffaello Giulietti]

On Thu, 25 Sep 2025 18:27:12 GMT, Johannes Graham <duke at openjdk.org> wrote:

>> Johannes Graham has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update assert
>
> Thank you all for your time.

@j3graham 
> This also facilitates potential cleanups in FloatingDecimal (removal of getChars method) but I've left that for later to minimize conflicts with other changes there.

Do you plan to address the removal of getChars() anytime soon?
No pressure here, but since I'm working on `FloatingDecimal` as well, I just want to make sure we don't step on each other's toes.

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PR Comment: https://git.openjdk.org/jdk/pull/27118#issuecomment-3352287571