Language Subtag Registration

Mark Davis ☕️ mark at
Fri Oct 16 06:01:43 CEST 2015

On Thu, Oct 15, 2015 at 11:12 PM, Peter Constable <petercon at>

> A problem with using the "u" extension is that it's only usable in
> protocols and applications that support the "u" extension, but not by BCP
> 47 implementations generally.

​The same is actually true of variants; many implementations don't support

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