Appeal to ISO 639 RA in support of Elfdalian

[Doug Ewell]

Shawn Steele wrote:

>> If Elfdalian gets an ISO639-code later in 8 months, 20 months or 32
>> months, then the language subtag can be retired.
>
> Retiring tags is “hard”.  I’d rather that people used a private use
> tag until the RA had another chance to look at the issue.

Retiring subtags is easy, but getting users to migrate existing data and 
implementations to the new subtag is hard.

Every compliant implementation of BCP 47 should already support the 
mechanism to map deprecated subtags to their Preferred-Value, so adding 
another deprecated/preferred pair doesn't add to that problem. But this 
doesn't work for private-use subtags.

--
Doug Ewell | http://ewellic.org | Thornton, CO 🇺🇸