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Word boundaries are based on whether a character is alphanumeric or not. For the PG_UNICODE_FAST collation, alphanumeric includes non-ASCII digits; whereas for the PG_C_UTF8 collation, it only includes digits 0-9. Pass down the right information from the pg_locale_t into initcap_wbnext to differentiate the behavior. Reported-by: Noah Misch <noah@leadboat.com> Reviewed-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/20250417135841.33.nmisch@google.com