For read operations: the original language code from the provider. For write operations: fallback value used when value is omitted or "unmapped_value". You must ensure this matches the provider's format.
CategoryLanguageSourceValueUnion.CreateStr(/* values here */);CategoryLanguageSourceValueUnion.CreateNumber(/* values here */);CategoryLanguageSourceValueUnion.CreateBoolean(/* values here */);CategoryLanguageSourceValueUnion.CreateCategorySourceValueLanguage(/* values here */);CategoryLanguageSourceValueUnion.CreateArrayOfAny(/* values here */);