<i18n dev> RFR: 8364007: Add no-argument codePointCount method to CharSequence and String [v3]

[Tatsunori Uchino]

On Mon, 28 Jul 2025 09:16:15 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> I think we should mull over the addition of CharSequence::codePointCount. On the surface it looks like it fits but we can't rush it (CharSequence is widely implemented and additions to this interface have a history of disruption in the eco system).

We might as well defer it until another JBS issue if it is too difficult to decide whether it should be included in this PR.

> What is the reason for proposing Character.codePointCount(CharSequence) aswell?

1. It already has an overload with the start and end indices unlike `CharSequence` like `String` and `AbstractStringBuilder`
2. Less harmful than `CharSequence::codePointCount` because it is just a static method.
3. There are already the `(CharSequence, int, int)` and `(char[], int, int)` overloads and the `(char[], int, int)` overload is used for the test for `String::codePointCount(int, int)`. We should add the `(char[])` overload for test and also add the `(CharSequence)` for consistency.

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PR Comment: https://git.openjdk.org/jdk/pull/26461#issuecomment-3126999990