RFR: 8367324: Avoid redundant parsing when formatting with DigitList [v3]

[Raffaello Giulietti]

On Wed, 24 Sep 2025 14:41:07 GMT, Johannes Graham <duke at openjdk.org> wrote:

>> src/java.base/share/classes/java/text/DigitList.java line 326:
>> 
>>> 324:         boolean hasBeenRoundedUp = fdConverter.digitsRoundedUp();
>>> 325:         boolean valueExactAsDecimal = fdConverter.decimalDigitsExact();
>>> 326:         assert !fdConverter.isExceptional();
>> 
>> Maybe move this `assert` line at method entry.
>
> I moved it up as high as it can go. Alternatively, could be replaced with an assertion against the `source` parameter - `assert Double.isFinite(source)` ?

Even better!

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PR Review Comment: https://git.openjdk.org/jdk/pull/27118#discussion_r2376052985