What were you imagining they should be using java.lang.String.codePointCount() for ? Text is hard, like I said, and a count of Unicode code points is rarely what you need.
Examples of things which are assigned one or more Unicode code points: A harmless, invisible and ignorable marker; indication that subsequent neutral text is intended to be displayed right-to-left; the cedilla accent on a character; a lowercase x; a vertical tab; indication that a non-fatal error occurred in some previous processing.
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