RFR: 8339803: Acknowledge case insensitive unambiguous keywords in tzdata files [v2]

[Sean Coffey]

On Tue, 10 Sep 2024 22:42:37 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> This is a follow on fix to [JDK-8339644](https://bugs.openjdk.org/browse/JDK-8339644). It turned out that TZ data files allow abbreviation of keywords, such as "ZO" for "Zone." Same fix, i.e, replacing `startsWith()` with `regionMatches()` was applied.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   tz files aligned with the default TzdbZoneRulesProvider list

LGTM

`sun/util/calendar/zi/TestZoneInfo310.java` exercises the tzdb compiler. I wonder if it's worth adding some dummy rules which test the new leniency added to the compiler ? (perhaps even just to the jdk11_backward file included in the test dir)

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PR Comment: https://git.openjdk.org/jdk/pull/20940#issuecomment-2343959123