<i18n dev> RFR: 8317742: ISO Standard Date Format implementation consistency on DateTimeFormatter and String.format [v8]

[Roger Riggs]

On Sun, 19 Nov 2023 02:19:52 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> `JapaneseChronology` is not extending `IsoChronology`, and that is the gist of the change I suggested.
>
> I added the testcase of IsoChronology and it also passed.

The distinction is pretty subtle, I was referring to the `Chronology.isISOBased()` method. (True for JapaneseChronology).
IsoChronology is final, so there are no subclasses.
This does address the compatibility issue and is an improvement over the original proposal.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16033#discussion_r1398626377