RFR: 8334742: Change java.time month/day field types to 'byte' [v2]

[Naoto Sato]

On Wed, 30 Apr 2025 20:38:59 GMT, Gautham Krishnan <duke at openjdk.org> wrote:

>> In the following classes, month and day values are stored in fields of type 'int' or 'short'. The range of allowed values is small enough that the type can be 'byte' instead.
>> 
>> java.time.YearMonth
>> java.time.MonthDay
>> java.time.LocalDate
>> java.time.chono.HijrahDate
>> 
>> Refactoring the type will give the JVM a little more layout flexibility, and will be especially useful when these classes become value classes.
>
> Gautham Krishnan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updating copyright header

Since they are serialized fields (except Hijrah ones), I don't think this is doable.

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PR Comment: https://git.openjdk.org/jdk/pull/24975#issuecomment-2843247511