<i18n dev> RFR: 8364365: HKSCS encoder does not properly set the replacement character

[Volkan Yazici]

On Wed, 6 Aug 2025 02:17:15 GMT, Xueming Shen <sherman at openjdk.org> wrote:

> if the replacement character's target sub-charset does not match the 'existing' sub-charset

In such a `replacement`, does `CharsetEncoder::isLegalReplacement` still return `true`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26635#discussion_r2256646879