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In en_ZA locale (legacy one), NumberElements aren't defined and the default ones of Locale.ROOT are used. NumberElements for en_ZA need to be defined.
Per 8165282 request, we don't change the en_ZA locale data for COMPAT even it's not match to CLDR definition. Closed it as not fix.
There's a related bug report (JDK-816528) which suggests that the legacy en_ZA locale data be kept unchanged.