[OpenType] Language System Tags for Iroquoian languages (Cayuga, etc.)

[moyogo]

Please add Language System Tags for Cayuga (ISO 639-3: cay), Oneida (ISO 639-3: one), Onondaga (ISO 639-3: ono), Seneca (ISO 639-3: see), Tuscarora (ISO 639-3: tus), Wendat (ISO 639-3: wdt), Wyandot (ISO 639-3: wyn).

The Reg Henry orthography of Cayuga often uses an angular left hook below and an angular modifier glottal stop.
With Unicode, these are usually represented with ogonek letters Ę, ę, Ǫ, ǫ and the single quote ’, the modifier letter apostrophe ʼ, the superscript seven ⁷, or the modifier letter ˀ.

It would be useful to have a language system tag for Cayuga or other Iroquois languages if one wants implement font features for those languages.

Language System	Language System Tag	Corresponding ISO 639 ID (if applicable)
Cayuga	'CAY '	cay
Oneida	'ONE '	one
Onondaga	'ONO '	ono
Seneca	'SEE '	see
Tuscarora	'TUS '	tus
Wendat	'WDT '	wdt
Wyandot	'WYN '	wyn

Note that there is a ISO 639-1 code for Iroquaian languages, as well as other Iroquaian languages with ISO 639-3 codes but they are not proposed here.

[PeterCon]

If they all follow the same typographic conventions, would it not be useful to have a tag ('IRO '?) for Iroquoian languages?

[PeterCon]

See OT 1.9.1 alpha for draft revisions addressing this issue.

[moyogo]

It's not clear if all Iroquois languages follow the same style for those characters at this point.