Support for ISO 639-3 (Extended ISO 639-2/Alpha 2)
Support for tags like yue
would be really great as there isn't really an alternative tag for yue
in ISO 639-2 or as a BCP 47.
Error: 'yue' is not a valid IETF BCP 47/RFC 5646 language tag in '--language 0:yue'. Additional information from the parser: The value 'yue' is not a valid ISO 639 language code.