Here is an interesting case:
<
https://meta.wikimedia.org/wiki/Talk:Language_committee#Requests_for_new_la…gt;;
the mentioned TWN discussion is at <
https://translatewiki.net/wiki/Thread:Support/Please_enable_Tunica_for_tran…
The language <https://en.wikipedia.org/wiki/Tunica_language> (ISO 639-3:
tun) is extinct, but apparently there are revitalisation efforts. Does
anyone know more about these efforts and their "quality"? The policy, of
course, would require "a sufficient number of living native speakers to
form a viable community and audience".