[jdk17u-dev] RFR: 8335252: Reduce size of j.u.Formatter.Conversion#isValid

[Paul Hohensee]

On Thu, 22 May 2025 20:54:37 GMT, Paul Hohensee <phh at openjdk.org> wrote:

> Clean backport to fix a regression resulting from [JDK-8263038](https://bugs.openjdk.org/browse/JDK-8263038). No semantic change, test/jdk/java/util/Formatter tests pass.

Right, but it's a followup to a JDK 17 enhancement which caused a performance regression which we (Amazon) encountered in production and fixed in our internal distro. Thanks for the approval!

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/3609#issuecomment-2976154294